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Code Issues Releases Activity

GH-110383: Improve Tutorial for Input Ouput (#119230)

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Co-authored-by: edson duarte <eduarte.uatach@gmail.com>
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Blaise Pabon 2024-05-21 12:25:37 -04:00 committed by GitHub
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Doc/tutorial/inputoutput.rst
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@ -37,16 +37,23 @@ printing space-separated values. There are several ways to format output.
* The :meth:`str.format` method of strings requires more manual
effort. You'll still use ``{`` and ``}`` to mark where a variable
will be substituted and can provide detailed formatting directives,
but you'll also need to provide the information to be formatted.
but you'll also need to provide the information to be formatted. In the following code
block there are two examples of how to format variables:
::
>>> yes_votes = 42_572_654
>>> no_votes = 43_132_495
>>> percentage = yes_votes / (yes_votes + no_votes)
>>> total_votes = 85_705_149
>>> percentage = yes_votes / total_votes
>>> '{:-9} YES votes {:2.2%}'.format(yes_votes, percentage)
' 42572654 YES votes 49.67%'
Notice how the ``yes_votes`` are padded with spaces and a negative sign only for negative numbers.
The example also prints ``percentage`` multiplied by 100, with 2 decimal
places and followed by a percent sign (see :ref:`formatspec` for details).
* Finally, you can do all the string handling yourself by using string slicing and
concatenation operations to create any layout you can imagine. The
string type has some methods that perform useful operations for padding
@ -197,7 +204,12 @@ notation. ::
Jack: 4098; Sjoerd: 4127; Dcab: 8637678
This is particularly useful in combination with the built-in function
:func:`vars`, which returns a dictionary containing all local variables.
:func:`vars`, which returns a dictionary containing all local variables::
>>> table = {k: str(v) for k, v in vars().items()}
>>> message = " ".join([f'{k}: ' + '{' + k +'};' for k in table.keys()])
>>> print(message.format(**table))
__name__: __main__; __doc__: None; __package__: None; __loader__: ...
As an example, the following lines produce a tidily aligned
set of columns giving integers and their squares and cubes::