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gh-110383: Fix problems in Python Input and Output tutorial #118970

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eb04e27
Add explanation to formats in 7.1
uatach May 12, 2024
2166f58
Add example using built-in vars in 7.1.2
uatach May 12, 2024
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9 changes: 8 additions & 1 deletion Doc/tutorial/inputoutput.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,8 @@ printing space-separated values. There are several ways to format output.
>>> yes_votes = 42_572_654
>>> no_votes = 43_132_495
>>> percentage = yes_votes / (yes_votes + no_votes)
>>> # Print yes_votes padded with spaces and a negative sign only for negative numbers
>>> # Also print percentage multiplied by 100, with 2 decimal places and followed by a percent sign:
>>> '{:-9} YES votes {:2.2%}'.format(yes_votes, percentage)
' 42572654 YES votes 49.67%'

Expand Down Expand Up @@ -197,7 +199,12 @@ 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__: <class '_frozen_importlib.BuiltinImporter'>; __spec__: None; __annotations__: {}; __builtins__: <module 'builtins' (built-in)>;

As an example, the following lines produce a tidily aligned
set of columns giving integers and their squares and cubes::
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