Python

Important Statements

Exception handling

The assert Statement

Used for debugging. Tests a condition, and if the condition is false, it raises an AssertionError.

assert condition, message

• condition: An expression that should be true for the program to continue correctly.
• message: An optional string that will be included with the AssertionError if the condition is false.

Example:

def divide(a, b):
    assert b != 0, "Denominator cannot be zero"
    return a / b

# This will work:
print(divide(10, 2))

# This will raise an AssertionError:
print(divide(10, 0))

• If the condition is True, nothing happens.
• If the condition is False, an AssertionError is raised, optionally with the provided message.
• assert statements are typically removed or ignored when Python is run in optimized mode (python -O).