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  r74614 | georg.brandl | 2009-09-01 09:40:54 +0200 (Di, 01 Sep 2009) | 1 line

  #6813: better documentation for numberless string formats.
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Georg Brandl 2009-09-01 07:42:40 +00:00
parent c9a5a0e165
commit 2f3ed6808e
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15
Doc/tutorial/inputoutput.rst
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@ -126,12 +126,12 @@ with zeros. It understands about plus and minus signs::
Basic usage of the :meth:`str.format` method looks like this::
>>> print('We are the {0} who say "{1}!"'.format('knights', 'Ni'))
>>> print('We are the {} who say "{}!"'.format('knights', 'Ni'))
We are the knights who say "Ni!"
The brackets and characters within them (called format fields) are replaced with
the objects passed into the :meth:`~str.format` method. The number in the
brackets refers to the position of the object passed into the
the objects passed into the :meth:`~str.format` method. A number in the
brackets can be used to refer to the position of the object passed into the
:meth:`~str.format` method. ::
>>> print('{0} and {1}'.format('spam', 'eggs'))
@ -152,6 +152,15 @@ Positional and keyword arguments can be arbitrarily combined::
other='Georg'))
The story of Bill, Manfred, and Georg.
``'!a'`` (apply :func:`ascii`), ``'!s'`` (apply :func:`str`) and ``'!r'``
(apply :func:`repr`) can be used to convert the value before it is formatted::
>>> import math
>>> print('The value of PI is approximately {}.'.format(math.pi))
The value of PI is approximately 3.14159265359.
>>> print('The value of PI is approximately {!r}.'.format(math.pi))
The value of PI is approximately 3.141592653589793.
An optional ``':'`` and format specifier can follow the field name. This allows
greater control over how the value is formatted. The following example
truncates Pi to three places after the decimal.