Python Boolean: Difference between revisions
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(Created page with "=Internal= * Python Language =Overview= <syntaxhighlight lang='python'> x = True type(x) <class 'bool'> </syntaxhighlight> =Operators= ==OR <tt>|</...") |
Tag: Manual revert |
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* [[Python_Language#Boolean|Python Language]] | * [[Python_Language#Boolean|Python Language]] | ||
=Overview= | =Overview= | ||
A boolean can be <code>True</code> or <code>False</code>. | |||
<syntaxhighlight lang='python'> | <syntaxhighlight lang='python'> | ||
x = True | x = True | ||
| Line 7: | Line 8: | ||
<class 'bool'> | <class 'bool'> | ||
</syntaxhighlight> | </syntaxhighlight> | ||
=What is True?= | |||
The following values evaluate to <code>False</code> in Python. Everything else evaluates to <code>True</code>. | |||
* boolean <code>False</code> | |||
* <code>None</code> | |||
* zero integer <code>0</code> | |||
* zero float <code>0.0</code> | |||
* empty string <code>''</code> | |||
* empty list <code>[]</code> | |||
* empty tuple <code>()</code> | |||
* empty dict <code>{}</code> | |||
* empty set <code>set()</code> | |||
=Operators= | =Operators= | ||
==OR <tt>|</tt> and <tt>|=</tt>== | ==OR: <tt>|</tt> and <tt>|=</tt>== | ||
<syntaxhighlight lang='py'> | |||
assert (True | True) | |||
assert (True or True) | |||
assert (True | False) | |||
assert (True or False) | |||
assert (False | True) | |||
assert (False or True) | |||
assert not (False | False) | |||
assert not (False or False) | |||
</syntaxhighlight> | |||
<syntaxhighlight lang='py'> | |||
l = [True, False] | |||
b = False | |||
for e in l: | |||
b |= e | |||
assert b | |||
l = [False, False] | |||
b = False | |||
for e in l: | |||
b |= e | |||
assert not b | |||
</syntaxhighlight> | |||
Note that <code>+</code> applied to booleans contest to integers. | |||
==AND: <tt>&</tt> and <tt>&=</tt>== | |||
<syntaxhighlight lang='py'> | |||
assert (True & True) | |||
assert (True and True) | |||
assert not (True & False) | |||
assert not (True and False) | |||
assert not (False & True) | |||
assert not (False and True) | |||
assert not (False & False) | |||
assert not (False and False) | |||
</syntaxhighlight> | |||
Latest revision as of 19:56, 16 May 2024
Internal
Overview
A boolean can be True or False.
x = True
type(x)
<class 'bool'>
What is True?
The following values evaluate to False in Python. Everything else evaluates to True.
- boolean
False None- zero integer
0 - zero float
0.0 - empty string
- empty list
[] - empty tuple
() - empty dict
{} - empty set
set()
Operators
OR: | and |=
assert (True | True)
assert (True or True)
assert (True | False)
assert (True or False)
assert (False | True)
assert (False or True)
assert not (False | False)
assert not (False or False)
l = [True, False]
b = False
for e in l:
b |= e
assert b
l = [False, False]
b = False
for e in l:
b |= e
assert not b
Note that + applied to booleans contest to integers.
AND: & and &=
assert (True & True)
assert (True and True)
assert not (True & False)
assert not (True and False)
assert not (False & True)
assert not (False and True)
assert not (False & False)
assert not (False and False)