not

KeywordPython 2.0+Beginner

Logical NOT operator; inverts a boolean value

Quick Info

Documentation
Official Docs
Python Version
2.0+

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Easy1 example
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Intermediate2 examples
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Expert1 example
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Quick Example

python
print(not True)
print(not False)

# Negating conditions
x = 5
if not x > 10:
    print("x is not greater than 10")

# Checking absence
fruits = ["apple", "banana"]
if "cherry" not in fruits:
    print("No cherry available")

# not with falsy values
print(not 0)
print(not "")
print(not None)
print(not [])

'not' returns True if the value is falsy, False if truthy. It always returns a boolean, unlike 'and' and 'or'.

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Tags

languagesyntaxcorebooleanlogicoperator

Related Items

and
Keyword
Logical AND operator; returns True if both operands are true
or
Keyword
Logical OR operator; returns True if at least one operand is true
if
Keyword
Starts a conditional statement; executes block only if condition is true
bool()
Built-in Function
Converts a value to a Boolean (True or False)
__bool__
Dunder Method
Called by bool(); defines truthiness of the object