61 lines
2.0 KiB
Markdown
61 lines
2.0 KiB
Markdown
---
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title: Python Bool Function
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---
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`bool()` is a built-in function in Python 3\. This function returns a Boolean value, i.e. True or False. It takes one argument, `x`.
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## Arguments
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It takes one argument, `x`. `x` is converted using the standard <a href='https://docs.python.org/3/library/stdtypes.html#truth' target='_blank' rel='nofollow'>Truth Testing Procedure</a>.
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## Return Value
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If `x` is false or omitted, this returns `False`; otherwise it returns `True`.
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## Comparison Operators
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There are three Boolean Operators they are `and`, `or`, and `not`.
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### and
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| expression | result |
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| --- | --- |
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| true `and` true | true |
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| true `and` false | false |
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| false `and` true | false |
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| false `and` false | false |
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### or
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| expression | result |
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| --- | --- |
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| true `or` true | true |
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| true `or` false | true |
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| false `or` true | true |
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| false `or` false | false |
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### not
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| expression | result |
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| --- | --- |
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| `not` true | false |
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| `not` false | true |
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## Code Sample
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print(bool(4 > 2)) # Returns True as 4 is greater than 2
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print(bool(4 < 2)) # Returns False as 4 is not less than 2
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print(bool(4 == 4)) # Returns True as 4 is equal to 4
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print(bool(4 != 4)) # Returns False as 4 is equal to 4 so inequality doesn't holds
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print(bool(4)) # Returns True as 4 is a non-zero value
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print(bool(-4)) # Returns True as -4 is a non-zero value
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print(bool(0)) # Returns False as it is a zero value
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print(bool('dskl')) # Returns True as the string is a non-zero value
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print(bool('')) # Returns False as the string is a zero value
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print(bool([1, 2, 3])) # Returns True as the list is a non-zero value
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print(bool((2,3,4))) # Returns True as tuple is a non-zero value
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print(bool([])) # Returns False as list is empty and equal to 0 according to truth value testing
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<a href='https://repl.it/CVCS/2' target='_blank' rel='nofollow'>Run Code</a>
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<a href='https://docs.python.org/3/library/functions.html#bool' target='_blank' rel='nofollow'>Official Docs</a>
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