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author | Benjamin Peterson <benjamin@python.org> | 2008-12-27 16:00:54 (GMT) |
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committer | Benjamin Peterson <benjamin@python.org> | 2008-12-27 16:00:54 (GMT) |
commit | 9203501bae35a7a6fbec2287324382075177872d (patch) | |
tree | 1ade1461976906524369405232bb36ac704c7148 /Doc/tutorial | |
parent | db5fe667311745a2bc86355620354449721545f3 (diff) | |
download | cpython-9203501bae35a7a6fbec2287324382075177872d.zip cpython-9203501bae35a7a6fbec2287324382075177872d.tar.gz cpython-9203501bae35a7a6fbec2287324382075177872d.tar.bz2 |
Merged revisions 67889-67892,67895,67898,67904-67907,67912,67918,67920-67921,67923-67924,67926-67927,67930,67943 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk
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r67889 | benjamin.peterson | 2008-12-20 19:04:32 -0600 (Sat, 20 Dec 2008) | 1 line
sphinx.web is long gone
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r67890 | benjamin.peterson | 2008-12-20 19:12:26 -0600 (Sat, 20 Dec 2008) | 1 line
update readme
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r67891 | benjamin.peterson | 2008-12-20 19:14:47 -0600 (Sat, 20 Dec 2008) | 1 line
there are way too many places which need to have the current version added
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r67892 | benjamin.peterson | 2008-12-20 19:29:32 -0600 (Sat, 20 Dec 2008) | 9 lines
Merged revisions 67809 via svnmerge from
svn+ssh://pythondev@svn.python.org/sandbox/trunk/2to3/lib2to3
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r67809 | benjamin.peterson | 2008-12-15 21:54:45 -0600 (Mon, 15 Dec 2008) | 1 line
fix logic error
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r67895 | neal.norwitz | 2008-12-21 08:28:32 -0600 (Sun, 21 Dec 2008) | 2 lines
Add Tarek for work on distutils.
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r67898 | benjamin.peterson | 2008-12-21 15:00:53 -0600 (Sun, 21 Dec 2008) | 1 line
compute DISTVERSION with patchlevel.py
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r67904 | benjamin.peterson | 2008-12-22 14:44:58 -0600 (Mon, 22 Dec 2008) | 1 line
less attitude
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r67905 | benjamin.peterson | 2008-12-22 14:51:15 -0600 (Mon, 22 Dec 2008) | 1 line
fix #4720: the format to PyArg_ParseTupleAndKeywords can now start with '|'
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r67906 | benjamin.peterson | 2008-12-22 14:52:53 -0600 (Mon, 22 Dec 2008) | 1 line
add NEWS note
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r67907 | benjamin.peterson | 2008-12-22 16:12:19 -0600 (Mon, 22 Dec 2008) | 1 line
silence compiler warning
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r67912 | georg.brandl | 2008-12-23 06:37:21 -0600 (Tue, 23 Dec 2008) | 2 lines
Fix missing "svn" command.
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r67918 | georg.brandl | 2008-12-23 09:44:25 -0600 (Tue, 23 Dec 2008) | 2 lines
Markup fix.
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r67920 | benjamin.peterson | 2008-12-23 14:09:28 -0600 (Tue, 23 Dec 2008) | 1 line
use a global variable, so the compiler doesn't optimize the assignment out
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r67921 | benjamin.peterson | 2008-12-23 14:12:33 -0600 (Tue, 23 Dec 2008) | 1 line
make global static
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r67923 | benjamin.peterson | 2008-12-24 09:10:27 -0600 (Wed, 24 Dec 2008) | 1 line
#4736 BufferRWPair.closed shouldn't try to call another property as a function
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r67924 | benjamin.peterson | 2008-12-24 10:10:05 -0600 (Wed, 24 Dec 2008) | 1 line
pretend exceptions don't exist a while longer
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r67926 | tarek.ziade | 2008-12-24 13:10:05 -0600 (Wed, 24 Dec 2008) | 1 line
fixed #4400 : distutils .pypirc default generated file was broken.
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r67927 | benjamin.peterson | 2008-12-26 17:26:30 -0600 (Fri, 26 Dec 2008) | 1 line
python version is included in file name now
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r67930 | hirokazu.yamamoto | 2008-12-26 22:19:48 -0600 (Fri, 26 Dec 2008) | 2 lines
Issue #4740: Use HIGHEST_PROTOCOL in pickle test.
(There is no behavior difference in 2.x because HIGHEST_PROTOCOL == 2)
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r67943 | alexandre.vassalotti | 2008-12-27 04:02:59 -0600 (Sat, 27 Dec 2008) | 2 lines
Fix bogus unicode tests in pickletester.
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Diffstat (limited to 'Doc/tutorial')
-rw-r--r-- | Doc/tutorial/controlflow.rst | 34 |
1 files changed, 6 insertions, 28 deletions
diff --git a/Doc/tutorial/controlflow.rst b/Doc/tutorial/controlflow.rst index 000d9cb..b0b4478 100644 --- a/Doc/tutorial/controlflow.rst +++ b/Doc/tutorial/controlflow.rst @@ -200,42 +200,20 @@ required syntactically but the program requires no action. For example:: ... pass # Busy-wait for keyboard interrupt (Ctrl+C) ... -This is commonly used for creating minimal classes such as exceptions, or -for ignoring unwanted exceptions:: +This is commonly used for creating minimal classes:: - >>> class ParserError(Exception): + >>> class MyEmptyClass: ... pass - ... - >>> try: - ... import audioop - ... except ImportError: - ... pass - ... + ... Another place :keyword:`pass` can be used is as a place-holder for a function or -conditional body when you are working on new code, allowing you to keep -thinking at a more abstract level. However, as :keyword:`pass` is silently -ignored, a better choice may be to raise a :exc:`NotImplementedError` -exception:: +conditional body when you are working on new code, allowing you to keep thinking +at a more abstract level. The :keyword:`pass` is silently ignored:: >>> def initlog(*args): - ... raise NotImplementedError # Open logfile if not already open - ... if not logfp: - ... raise NotImplementedError # Set up dummy log back-end - ... raise NotImplementedError('Call log initialization handler') + ... pass # Remember to implement this! ... -If :keyword:`pass` were used here and you later ran tests, they may fail -without indicating why. Using :exc:`NotImplementedError` causes this code -to raise an exception, telling you exactly where the incomplete code -is. Note the two calling styles of the exceptions above. -The first style, with no message but with an accompanying comment, -lets you easily leave the comment when you remove the exception, -which ideally would be a good description for -the block of code the exception is a placeholder for. However, the -third example, providing a message for the exception, will produce -a more useful traceback. - .. _tut-functions: Defining Functions |