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#6211: elaborate a bit on ways to call the function.

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Georg Brandl 2009-06-06 17:50:05 +00:00
parent 9be5998760
commit 4c324b9801
1 changed files with 14 additions and 5 deletions
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19
Doc/tutorial/controlflow.rst
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@ -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.