If you're dealing with NumPy arrays (or subclasses like pandas.Series or pandas.DataFrame) containing booleans you can actually use the bitwise inverse operator (~) to negate all booleans in an array:

Apr 7, 2025 · The not keyword in Python is a logical operator used to obtain the negation or opposite Boolean value of an operand. It is a unary operator, meaning it takes only one operand and returns its complementary Boolean value. For example, if False is given as an operand to not, it returns True, and vice versa How to Use Not Operator in Python?

Python’s not operator allows you to invert the truth value of Boolean expressions and objects. You can use this operator in Boolean contexts, such as if statements and while loops. It also works in non-Boolean contexts, which allows you to invert the truth value of your variables.

The Python "not" operator is an essential tool for logical negation in conditions, loops, and expressions. Learning to properly use the "not" Boolean operator lets you write cleaner, more readable code, especially when dealing with Boolean …

Oct 19, 2022 · It is used to get the negation of a value, i.e. it allows us to invert the truth value of a given boolean expression. This operator can be applied in boolean situations like if statements and while loops. It also functions in non-Boolean settings, enabling you to …

May 24, 2011 · The negation operator in Python is not. Therefore just replace your ! with not. For your example, do this: if not os.path.exists("/usr/share/sounds/blues") : proc = subprocess.Popen(["mkdir", "/usr/share/sounds/blues"]) proc.wait()

Explore Python's not operator to invert conditions, enhance logic, and streamline control structures. Learn practical examples to increase coding efficiency.

Jan 26, 2025 · The Python not operator is a powerful tool for reversing the truth value of boolean expressions. Understanding its fundamental concepts, usage methods, common practices, and best practices is essential for writing effective and maintainable Python code.

May 20, 2023 · The not operator (also called the logical NOT operator) in Python is used to invert or negate the truth value of any boolean condition or expression. This allows you to essentially flip the meaning of any True/False logical statement.

Negation is a tool with which you can express intended rules in code without writing new functions. If you write not is_even (10), the code will still work: In logic, double negation means positive: Now you know what the operators AND, OR and not mean. They allow you to specify compound conditions with two or more logical expressions.