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| -rw-r--r-- | Doc/tutorial/controlflow.rst | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/Doc/tutorial/controlflow.rst b/Doc/tutorial/controlflow.rst index cc1d334a7a..3c6d16468d 100644 --- a/Doc/tutorial/controlflow.rst +++ b/Doc/tutorial/controlflow.rst @@ -312,14 +312,23 @@ defined to allow. For example:: def ask_ok(prompt, retries=4, complaint='Yes or no, please!'): while True: ok = raw_input(prompt) - if ok in ('y', 'ye', 'yes'): return True - if ok in ('n', 'no', 'nop', 'nope'): return False + if ok in ('y', 'ye', 'yes'): + return True + if ok in ('n', 'no', 'nop', 'nope'): + return False retries = retries - 1 - if retries < 0: raise IOError('refusenik user') + if retries < 0: + raise IOError('refusenik user') print complaint -This function can be called either like this: ``ask_ok('Do you really want to -quit?')`` or like this: ``ask_ok('OK to overwrite the file?', 2)``. +This function can be called in several ways: + +* giving only the mandatory argument: + ``ask_ok('Do you really want to quit?')`` +* giving one of the optional arguments: + ``ask_ok('OK to overwrite the file?', 2)`` +* or even giving all arguments: + ``ask_ok('OK to overwrite the file?', 2, 'Come on, only yes or no!')`` This example also introduces the :keyword:`in` keyword. This tests whether or not a sequence contains a certain value. |