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BaseHTTPServer.py
21.93
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BaseHTTPServer.pyc
21.18
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BaseHTTPServer.pyo
21.18
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Bastion.py
5.61
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Bastion.pyc
6.5
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Bastion.pyo
6.5
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CGIHTTPServer.py
12.84
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CGIHTTPServer.pyc
10.84
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CGIHTTPServer.pyo
10.84
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ConfigParser.py
27.1
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ConfigParser.pyc
24.62
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ConfigParser.pyo
24.62
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Cookie.py
24.66
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Cookie.pyc
21.64
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Cookie.pyo
21.64
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DocXMLRPCServer.py
10.52
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DocXMLRPCServer.pyc
9.96
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DocXMLRPCServer.pyo
9.85
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HTMLParser.py
16.58
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HTMLParser.pyc
13.39
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HTMLParser.pyo
13.1
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MimeWriter.py
6.33
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MimeWriter.pyc
7.19
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MimeWriter.pyo
7.19
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Queue.py
8.36
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Queue.pyc
9.19
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Queue.pyo
9.19
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SimpleHTTPServer.py
7.25
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SimpleHTTPServer.pyc
7.55
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SimpleHTTPServer.pyo
7.55
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SimpleXMLRPCServer.py
25.17
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SimpleXMLRPCServer.pyc
22.31
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SimpleXMLRPCServer.pyo
22.31
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SocketServer.py
23.29
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SocketServer.pyc
23.49
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SocketServer.pyo
23.49
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StringIO.py
10.41
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StringIO.pyc
11.21
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StringIO.pyo
11.21
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UserDict.py
5.67
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UserDict.pyc
8.61
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UserDict.pyo
8.61
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UserList.py
3.56
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UserList.pyc
6.42
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UserList.pyo
6.42
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UserString.py
9.46
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UserString.pyc
14.52
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UserString.pyo
14.52
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_LWPCookieJar.py
6.4
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_LWPCookieJar.pyc
5.4
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_LWPCookieJar.pyo
5.4
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_MozillaCookieJar.py
5.67
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_MozillaCookieJar.pyc
4.37
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4.33
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__future__.py
4.28
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__future__.pyc
4.13
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__future__.pyo
4.13
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__phello__.foo.py
64
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__phello__.foo.pyc
125
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__phello__.foo.pyo
125
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17.45
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_abcoll.pyc
24.4
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_abcoll.pyo
24.4
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_osx_support.py
18.03
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_osx_support.pyc
11.28
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_osx_support.pyo
11.28
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67.24
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62.71
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62.71
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19.75
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14.53
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14.53
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_sysconfigdata.py
17.56
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_sysconfigdata.pyc
20.72
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20.72
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_threading_local.py
7.28
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_threading_local.pyc
6.45
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6.45
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_weakrefset.py
5.48
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_weakrefset.pyc
9.25
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_weakrefset.pyo
9.25
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abc.py
6.98
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abc.pyc
6
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abc.pyo
5.94
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aifc.py
32.94
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aifc.pyc
29.31
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aifc.pyo
29.31
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antigravity.py
60
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antigravity.pyc
203
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antigravity.pyo
203
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anydbm.py
2.6
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anydbm.pyc
2.73
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anydbm.pyo
2.73
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argparse.py
86.46
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argparse.pyc
62.57
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argparse.pyo
62.41
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ast.py
11.53
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ast.pyc
12.65
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ast.pyo
12.65
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asynchat.py
11.13
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asynchat.pyc
8.44
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asynchat.pyo
8.44
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asyncore.py
20.36
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asyncore.pyc
18.4
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asyncore.pyo
18.4
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atexit.py
1.67
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atexit.pyc
2.15
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atexit.pyo
2.15
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audiodev.py
7.42
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audiodev.pyc
8.27
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audiodev.pyo
8.27
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base64.py
11.09
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base64.pyc
10.63
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base64.pyo
10.63
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bdb.py
21.21
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bdb.pyc
18.65
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bdb.pyo
18.65
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binhex.py
14.14
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binhex.pyc
15.04
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binhex.pyo
15.04
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bisect.py
2.53
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bisect.pyc
3
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bisect.pyo
3
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cProfile.py
6.43
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cProfile.pyc
6.25
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cProfile.pyo
6.25
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calendar.py
22.76
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calendar.pyc
27.13
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calendar.pyo
27.13
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cgi.py
33.68
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cgi.pyc
31.71
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cgi.pyo
31.71
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cgitb.py
11.89
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cgitb.pyc
11.9
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cgitb.pyo
11.9
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chunk.py
5.25
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chunk.pyc
5.46
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chunk.pyo
5.46
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cmd.py
14.67
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cmd.pyc
13.71
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cmd.pyo
13.71
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code.py
9.95
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code.pyc
10.09
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code.pyo
10.09
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codecs.py
34.44
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codecs.pyc
35.74
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codecs.pyo
35.74
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codeop.py
5.86
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codeop.pyc
6.44
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codeop.pyo
6.44
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collections.py
25.28
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collections.pyc
23.99
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collections.pyo
23.94
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colorsys.py
3.6
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colorsys.pyc
3.9
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colorsys.pyo
3.9
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commands.py
2.49
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commands.pyc
2.41
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commands.pyo
2.41
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compileall.py
7.58
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compileall.pyc
6.85
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compileall.pyo
6.85
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contextlib.py
4.32
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contextlib.pyc
4.35
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contextlib.pyo
4.35
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cookielib.py
63.21
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cookielib.pyc
53.55
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cookielib.pyo
53.37
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copy.py
11.25
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copy.pyc
11.91
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copy.pyo
11.82
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copy_reg.py
6.64
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copy_reg.pyc
4.99
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copy_reg.pyo
4.95
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crypt.py
2.24
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crypt.pyc
2.89
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crypt.pyo
2.89
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csv.py
15.96
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csv.pyc
13.14
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csv.pyo
13.14
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dbhash.py
498
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dbhash.pyc
718
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dbhash.pyo
718
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decimal.py
215.84
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decimal.pyc
167.33
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decimal.pyo
167.33
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difflib.py
80.42
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difflib.pyc
60.5
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difflib.pyo
60.45
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dircache.py
1.1
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dircache.pyc
1.54
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dircache.pyo
1.54
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dis.py
6.35
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dis.pyc
6.08
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dis.pyo
6.08
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doctest.py
102.01
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doctest.pyc
81.45
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doctest.pyo
81.17
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dumbdbm.py
8.61
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dumbdbm.pyc
6.41
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dumbdbm.pyo
6.41
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dummy_thread.py
4.31
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dummy_thread.pyc
5.27
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dummy_thread.pyo
5.27
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dummy_threading.py
2.74
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dummy_threading.pyc
1.25
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dummy_threading.pyo
1.25
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filecmp.py
9.36
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filecmp.pyc
9.4
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filecmp.pyo
9.4
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fileinput.py
13.81
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fileinput.pyc
14.48
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fileinput.pyo
14.48
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fnmatch.py
3.16
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fnmatch.pyc
3.45
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fnmatch.pyo
3.45
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formatter.py
14.56
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formatter.pyc
18.73
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formatter.pyo
18.73
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fpformat.py
4.59
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fpformat.pyc
4.56
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fpformat.pyo
4.56
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fractions.py
21.87
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fractions.pyc
19.27
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fractions.pyo
19.27
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ftplib.py
36.1
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ftplib.pyc
33.38
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ftplib.pyo
33.38
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functools.py
4.37
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functools.pyc
5.95
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functools.pyo
5.95
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genericpath.py
2.94
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genericpath.pyc
3.19
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genericpath.pyo
3.19
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getopt.py
7.15
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getopt.pyc
6.5
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getopt.pyo
6.45
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getpass.py
5.43
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getpass.pyc
4.63
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getpass.pyo
4.63
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gettext.py
19.47
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gettext.pyc
15.19
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gettext.pyo
15.19
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glob.py
2.86
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glob.pyc
2.83
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glob.pyo
2.83
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gzip.py
18.26
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gzip.pyc
14.72
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gzip.pyo
14.72
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hashlib.py
7.48
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hashlib.pyc
6.74
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hashlib.pyo
6.74
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heapq.py
17.76
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heapq.pyc
14.13
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heapq.pyo
14.13
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hmac.py
4.48
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hmac.pyc
4.44
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hmac.pyo
4.44
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htmlentitydefs.py
17.63
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htmlentitydefs.pyc
6.22
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htmlentitydefs.pyo
6.22
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htmllib.py
12.57
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htmllib.pyc
19.83
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htmllib.pyo
19.83
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httplib.py
51.37
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httplib.pyc
37.54
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httplib.pyo
37.37
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ihooks.py
18.54
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ihooks.pyc
20.87
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ihooks.pyo
20.87
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imaplib.py
47.14
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imaplib.pyc
44.28
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imaplib.pyo
41.63
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imghdr.py
3.46
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imghdr.pyc
4.73
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imghdr.pyo
4.73
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imputil.py
25.16
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imputil.pyc
15.26
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imputil.pyo
15.08
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inspect.py
41.47
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inspect.pyc
39.04
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inspect.pyo
39.04
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io.py
3.12
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io.pyc
3.4
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io.pyo
3.4
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keyword.py
1.95
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keyword.pyc
2.06
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keyword.pyo
2.06
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linecache.py
3.87
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linecache.pyc
3.14
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linecache.pyo
3.14
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locale.py
87.33
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locale.pyc
48.77
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locale.pyo
48.77
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macpath.py
6.11
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macpath.pyc
7.47
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macpath.pyo
7.47
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macurl2path.py
3.2
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macurl2path.pyc
2.71
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macurl2path.pyo
2.71
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mailbox.py
78.86
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mailbox.pyc
74.87
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mailbox.pyo
74.82
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mailcap.py
7.25
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mailcap.pyc
6.92
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mailcap.pyo
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${this.title}
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Code Editor : fractions.py
# Originally contributed by Sjoerd Mullender. # Significantly modified by Jeffrey Yasskin <jyasskin at gmail.com>. """Rational, infinite-precision, real numbers.""" from __future__ import division from decimal import Decimal import math import numbers import operator import re __all__ = ['Fraction', 'gcd'] Rational = numbers.Rational def gcd(a, b): """Calculate the Greatest Common Divisor of a and b. Unless b==0, the result will have the same sign as b (so that when b is divided by it, the result comes out positive). """ while b: a, b = b, a%b return a _RATIONAL_FORMAT = re.compile(r""" \A\s* # optional whitespace at the start, then (?P<sign>[-+]?) # an optional sign, then (?=\d|\.\d) # lookahead for digit or .digit (?P<num>\d*) # numerator (possibly empty) (?: # followed by (?:/(?P<denom>\d+))? # an optional denominator | # or (?:\.(?P<decimal>\d*))? # an optional fractional part (?:E(?P<exp>[-+]?\d+))? # and optional exponent ) \s*\Z # and optional whitespace to finish """, re.VERBOSE | re.IGNORECASE) class Fraction(Rational): """This class implements rational numbers. In the two-argument form of the constructor, Fraction(8, 6) will produce a rational number equivalent to 4/3. Both arguments must be Rational. The numerator defaults to 0 and the denominator defaults to 1 so that Fraction(3) == 3 and Fraction() == 0. Fractions can also be constructed from: - numeric strings similar to those accepted by the float constructor (for example, '-2.3' or '1e10') - strings of the form '123/456' - float and Decimal instances - other Rational instances (including integers) """ __slots__ = ('_numerator', '_denominator') # We're immutable, so use __new__ not __init__ def __new__(cls, numerator=0, denominator=None): """Constructs a Fraction. Takes a string like '3/2' or '1.5', another Rational instance, a numerator/denominator pair, or a float. Examples -------- >>> Fraction(10, -8) Fraction(-5, 4) >>> Fraction(Fraction(1, 7), 5) Fraction(1, 35) >>> Fraction(Fraction(1, 7), Fraction(2, 3)) Fraction(3, 14) >>> Fraction('314') Fraction(314, 1) >>> Fraction('-35/4') Fraction(-35, 4) >>> Fraction('3.1415') # conversion from numeric string Fraction(6283, 2000) >>> Fraction('-47e-2') # string may include a decimal exponent Fraction(-47, 100) >>> Fraction(1.47) # direct construction from float (exact conversion) Fraction(6620291452234629, 4503599627370496) >>> Fraction(2.25) Fraction(9, 4) >>> Fraction(Decimal('1.47')) Fraction(147, 100) """ self = super(Fraction, cls).__new__(cls) if denominator is None: if isinstance(numerator, Rational): self._numerator = numerator.numerator self._denominator = numerator.denominator return self elif isinstance(numerator, float): # Exact conversion from float value = Fraction.from_float(numerator) self._numerator = value._numerator self._denominator = value._denominator return self elif isinstance(numerator, Decimal): value = Fraction.from_decimal(numerator) self._numerator = value._numerator self._denominator = value._denominator return self elif isinstance(numerator, basestring): # Handle construction from strings. m = _RATIONAL_FORMAT.match(numerator) if m is None: raise ValueError('Invalid literal for Fraction: %r' % numerator) numerator = int(m.group('num') or '0') denom = m.group('denom') if denom: denominator = int(denom) else: denominator = 1 decimal = m.group('decimal') if decimal: scale = 10**len(decimal) numerator = numerator * scale + int(decimal) denominator *= scale exp = m.group('exp') if exp: exp = int(exp) if exp >= 0: numerator *= 10**exp else: denominator *= 10**-exp if m.group('sign') == '-': numerator = -numerator else: raise TypeError("argument should be a string " "or a Rational instance") elif (isinstance(numerator, Rational) and isinstance(denominator, Rational)): numerator, denominator = ( numerator.numerator * denominator.denominator, denominator.numerator * numerator.denominator ) else: raise TypeError("both arguments should be " "Rational instances") if denominator == 0: raise ZeroDivisionError('Fraction(%s, 0)' % numerator) g = gcd(numerator, denominator) self._numerator = numerator // g self._denominator = denominator // g return self @classmethod def from_float(cls, f): """Converts a finite float to a rational number, exactly. Beware that Fraction.from_float(0.3) != Fraction(3, 10). """ if isinstance(f, numbers.Integral): return cls(f) elif not isinstance(f, float): raise TypeError("%s.from_float() only takes floats, not %r (%s)" % (cls.__name__, f, type(f).__name__)) if math.isnan(f) or math.isinf(f): raise TypeError("Cannot convert %r to %s." % (f, cls.__name__)) return cls(*f.as_integer_ratio()) @classmethod def from_decimal(cls, dec): """Converts a finite Decimal instance to a rational number, exactly.""" from decimal import Decimal if isinstance(dec, numbers.Integral): dec = Decimal(int(dec)) elif not isinstance(dec, Decimal): raise TypeError( "%s.from_decimal() only takes Decimals, not %r (%s)" % (cls.__name__, dec, type(dec).__name__)) if not dec.is_finite(): # Catches infinities and nans. raise TypeError("Cannot convert %s to %s." % (dec, cls.__name__)) sign, digits, exp = dec.as_tuple() digits = int(''.join(map(str, digits))) if sign: digits = -digits if exp >= 0: return cls(digits * 10 ** exp) else: return cls(digits, 10 ** -exp) def limit_denominator(self, max_denominator=1000000): """Closest Fraction to self with denominator at most max_denominator. >>> Fraction('3.141592653589793').limit_denominator(10) Fraction(22, 7) >>> Fraction('3.141592653589793').limit_denominator(100) Fraction(311, 99) >>> Fraction(4321, 8765).limit_denominator(10000) Fraction(4321, 8765) """ # Algorithm notes: For any real number x, define a *best upper # approximation* to x to be a rational number p/q such that: # # (1) p/q >= x, and # (2) if p/q > r/s >= x then s > q, for any rational r/s. # # Define *best lower approximation* similarly. Then it can be # proved that a rational number is a best upper or lower # approximation to x if, and only if, it is a convergent or # semiconvergent of the (unique shortest) continued fraction # associated to x. # # To find a best rational approximation with denominator <= M, # we find the best upper and lower approximations with # denominator <= M and take whichever of these is closer to x. # In the event of a tie, the bound with smaller denominator is # chosen. If both denominators are equal (which can happen # only when max_denominator == 1 and self is midway between # two integers) the lower bound---i.e., the floor of self, is # taken. if max_denominator < 1: raise ValueError("max_denominator should be at least 1") if self._denominator <= max_denominator: return Fraction(self) p0, q0, p1, q1 = 0, 1, 1, 0 n, d = self._numerator, self._denominator while True: a = n//d q2 = q0+a*q1 if q2 > max_denominator: break p0, q0, p1, q1 = p1, q1, p0+a*p1, q2 n, d = d, n-a*d k = (max_denominator-q0)//q1 bound1 = Fraction(p0+k*p1, q0+k*q1) bound2 = Fraction(p1, q1) if abs(bound2 - self) <= abs(bound1-self): return bound2 else: return bound1 @property def numerator(a): return a._numerator @property def denominator(a): return a._denominator def __repr__(self): """repr(self)""" return ('Fraction(%s, %s)' % (self._numerator, self._denominator)) def __str__(self): """str(self)""" if self._denominator == 1: return str(self._numerator) else: return '%s/%s' % (self._numerator, self._denominator) def _operator_fallbacks(monomorphic_operator, fallback_operator): """Generates forward and reverse operators given a purely-rational operator and a function from the operator module. Use this like: __op__, __rop__ = _operator_fallbacks(just_rational_op, operator.op) In general, we want to implement the arithmetic operations so that mixed-mode operations either call an implementation whose author knew about the types of both arguments, or convert both to the nearest built in type and do the operation there. In Fraction, that means that we define __add__ and __radd__ as: def __add__(self, other): # Both types have numerators/denominator attributes, # so do the operation directly if isinstance(other, (int, long, Fraction)): return Fraction(self.numerator * other.denominator + other.numerator * self.denominator, self.denominator * other.denominator) # float and complex don't have those operations, but we # know about those types, so special case them. elif isinstance(other, float): return float(self) + other elif isinstance(other, complex): return complex(self) + other # Let the other type take over. return NotImplemented def __radd__(self, other): # radd handles more types than add because there's # nothing left to fall back to. if isinstance(other, Rational): return Fraction(self.numerator * other.denominator + other.numerator * self.denominator, self.denominator * other.denominator) elif isinstance(other, Real): return float(other) + float(self) elif isinstance(other, Complex): return complex(other) + complex(self) return NotImplemented There are 5 different cases for a mixed-type addition on Fraction. I'll refer to all of the above code that doesn't refer to Fraction, float, or complex as "boilerplate". 'r' will be an instance of Fraction, which is a subtype of Rational (r : Fraction <: Rational), and b : B <: Complex. The first three involve 'r + b': 1. If B <: Fraction, int, float, or complex, we handle that specially, and all is well. 2. If Fraction falls back to the boilerplate code, and it were to return a value from __add__, we'd miss the possibility that B defines a more intelligent __radd__, so the boilerplate should return NotImplemented from __add__. In particular, we don't handle Rational here, even though we could get an exact answer, in case the other type wants to do something special. 3. If B <: Fraction, Python tries B.__radd__ before Fraction.__add__. This is ok, because it was implemented with knowledge of Fraction, so it can handle those instances before delegating to Real or Complex. The next two situations describe 'b + r'. We assume that b didn't know about Fraction in its implementation, and that it uses similar boilerplate code: 4. If B <: Rational, then __radd_ converts both to the builtin rational type (hey look, that's us) and proceeds. 5. Otherwise, __radd__ tries to find the nearest common base ABC, and fall back to its builtin type. Since this class doesn't subclass a concrete type, there's no implementation to fall back to, so we need to try as hard as possible to return an actual value, or the user will get a TypeError. """ def forward(a, b): if isinstance(b, (int, long, Fraction)): return monomorphic_operator(a, b) elif isinstance(b, float): return fallback_operator(float(a), b) elif isinstance(b, complex): return fallback_operator(complex(a), b) else: return NotImplemented forward.__name__ = '__' + fallback_operator.__name__ + '__' forward.__doc__ = monomorphic_operator.__doc__ def reverse(b, a): if isinstance(a, Rational): # Includes ints. return monomorphic_operator(a, b) elif isinstance(a, numbers.Real): return fallback_operator(float(a), float(b)) elif isinstance(a, numbers.Complex): return fallback_operator(complex(a), complex(b)) else: return NotImplemented reverse.__name__ = '__r' + fallback_operator.__name__ + '__' reverse.__doc__ = monomorphic_operator.__doc__ return forward, reverse def _add(a, b): """a + b""" return Fraction(a.numerator * b.denominator + b.numerator * a.denominator, a.denominator * b.denominator) __add__, __radd__ = _operator_fallbacks(_add, operator.add) def _sub(a, b): """a - b""" return Fraction(a.numerator * b.denominator - b.numerator * a.denominator, a.denominator * b.denominator) __sub__, __rsub__ = _operator_fallbacks(_sub, operator.sub) def _mul(a, b): """a * b""" return Fraction(a.numerator * b.numerator, a.denominator * b.denominator) __mul__, __rmul__ = _operator_fallbacks(_mul, operator.mul) def _div(a, b): """a / b""" return Fraction(a.numerator * b.denominator, a.denominator * b.numerator) __truediv__, __rtruediv__ = _operator_fallbacks(_div, operator.truediv) __div__, __rdiv__ = _operator_fallbacks(_div, operator.div) def __floordiv__(a, b): """a // b""" # Will be math.floor(a / b) in 3.0. div = a / b if isinstance(div, Rational): # trunc(math.floor(div)) doesn't work if the rational is # more precise than a float because the intermediate # rounding may cross an integer boundary. return div.numerator // div.denominator else: return math.floor(div) def __rfloordiv__(b, a): """a // b""" # Will be math.floor(a / b) in 3.0. div = a / b if isinstance(div, Rational): # trunc(math.floor(div)) doesn't work if the rational is # more precise than a float because the intermediate # rounding may cross an integer boundary. return div.numerator // div.denominator else: return math.floor(div) def __mod__(a, b): """a % b""" div = a // b return a - b * div def __rmod__(b, a): """a % b""" div = a // b return a - b * div def __pow__(a, b): """a ** b If b is not an integer, the result will be a float or complex since roots are generally irrational. If b is an integer, the result will be rational. """ if isinstance(b, Rational): if b.denominator == 1: power = b.numerator if power >= 0: return Fraction(a._numerator ** power, a._denominator ** power) else: return Fraction(a._denominator ** -power, a._numerator ** -power) else: # A fractional power will generally produce an # irrational number. return float(a) ** float(b) else: return float(a) ** b def __rpow__(b, a): """a ** b""" if b._denominator == 1 and b._numerator >= 0: # If a is an int, keep it that way if possible. return a ** b._numerator if isinstance(a, Rational): return Fraction(a.numerator, a.denominator) ** b if b._denominator == 1: return a ** b._numerator return a ** float(b) def __pos__(a): """+a: Coerces a subclass instance to Fraction""" return Fraction(a._numerator, a._denominator) def __neg__(a): """-a""" return Fraction(-a._numerator, a._denominator) def __abs__(a): """abs(a)""" return Fraction(abs(a._numerator), a._denominator) def __trunc__(a): """trunc(a)""" if a._numerator < 0: return -(-a._numerator // a._denominator) else: return a._numerator // a._denominator def __hash__(self): """hash(self) Tricky because values that are exactly representable as a float must have the same hash as that float. """ # XXX since this method is expensive, consider caching the result if self._denominator == 1: # Get integers right. return hash(self._numerator) # Expensive check, but definitely correct. if self == float(self): return hash(float(self)) else: # Use tuple's hash to avoid a high collision rate on # simple fractions. return hash((self._numerator, self._denominator)) def __eq__(a, b): """a == b""" if isinstance(b, Rational): return (a._numerator == b.numerator and a._denominator == b.denominator) if isinstance(b, numbers.Complex) and b.imag == 0: b = b.real if isinstance(b, float): if math.isnan(b) or math.isinf(b): # comparisons with an infinity or nan should behave in # the same way for any finite a, so treat a as zero. return 0.0 == b else: return a == a.from_float(b) else: # Since a doesn't know how to compare with b, let's give b # a chance to compare itself with a. return NotImplemented def _richcmp(self, other, op): """Helper for comparison operators, for internal use only. Implement comparison between a Rational instance `self`, and either another Rational instance or a float `other`. If `other` is not a Rational instance or a float, return NotImplemented. `op` should be one of the six standard comparison operators. """ # convert other to a Rational instance where reasonable. if isinstance(other, Rational): return op(self._numerator * other.denominator, self._denominator * other.numerator) # comparisons with complex should raise a TypeError, for consistency # with int<->complex, float<->complex, and complex<->complex comparisons. if isinstance(other, complex): raise TypeError("no ordering relation is defined for complex numbers") if isinstance(other, float): if math.isnan(other) or math.isinf(other): return op(0.0, other) else: return op(self, self.from_float(other)) else: return NotImplemented def __lt__(a, b): """a < b""" return a._richcmp(b, operator.lt) def __gt__(a, b): """a > b""" return a._richcmp(b, operator.gt) def __le__(a, b): """a <= b""" return a._richcmp(b, operator.le) def __ge__(a, b): """a >= b""" return a._richcmp(b, operator.ge) def __nonzero__(a): """a != 0""" return a._numerator != 0 # support for pickling, copy, and deepcopy def __reduce__(self): return (self.__class__, (str(self),)) def __copy__(self): if type(self) == Fraction: return self # I'm immutable; therefore I am my own clone return self.__class__(self._numerator, self._denominator) def __deepcopy__(self, memo): if type(self) == Fraction: return self # My components are also immutable return self.__class__(self._numerator, self._denominator)
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