freeCodeCamp/guide/english/python/bool-function/index.md

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Python Bool Function

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.

Arguments

It takes one argument, x. x is converted using the standard Truth Testing Procedure.

Return Value

If x is false or omitted, this returns False; otherwise it returns True.

Comparison Operators

There are three Boolean Operators they are and, or, and not.

and

expression	result
true and true	true
true and false	false
false and true	false
false and false	false

or

expression	result
true or true	true
true or false	true
false or true	true
false or false	false

not

expression	result
not true	false
not false	true

Code Sample

print(bool(4 > 2)) # Returns True as 4 is greater than 2
print(bool(4 < 2)) # Returns False as 4 is not less than 2
print(bool(4 == 4)) # Returns True as 4 is equal to 4
print(bool(4 != 4)) # Returns False as 4 is equal to 4 so inequality doesn't holds
print(bool(4)) # Returns True as 4 is a non-zero value
print(bool(-4)) # Returns True as -4 is a non-zero value
print(bool(0)) # Returns False as it is a zero value
print(bool('dskl')) # Returns True as the string is a non-zero value
print(bool('')) # Returns False as the string is a zero value
print(bool([1, 2, 3])) # Returns True as the list is a non-zero value
print(bool((2,3,4))) # Returns True as tuple is a non-zero value
print(bool([])) # Returns False as list is empty and equal to 0 according to truth value testing

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