Define a function that checks if an integer is even.

To declare a function that determines the parity (evenness) of an integer input.

When you need to test the parity of an integer in Python code, such as in loops, conditionals, filters, or validation functions.

Used in numerical processing loops, list comprehensions, filter operations, validation helpers, and any code that requires even/odd checks.

def <function_name>(<param_name>: <param_type>) -> <return_type>:

def <name>(<params>) -> <return_type>:

function_name, param_name, param_type, return_type

• n
• int
• bool
• return
• if
• modulo
• %
• ==
• else

• function_name: any valid identifier
• param_name: any identifier
• param_type: any type
• return_type: any type

Missing colon, missing return statement, using assignment (=) instead of equality (==), confusing even/odd logic, forgetting to return a bool.

def is_odd(n: int) -> bool:, def is_multiple(n: int, divisor: int) -> bool:, def is_positive(n: int) -> bool:

Confusing n % 2 == 0 with n & 1 == 0 (bitwise); mixing up even vs. odd conditions; using n % 2 == 1 for even.

• def is_odd(n: int) -> bool:
• def is_multiple(n: int
• divisor: int) -> bool:
• def is_positive(n: int) -> bool:

Returns True for even numbers (including zero and negative evens) and False for odd numbers; works with negative integers due to Python's modulo semantics.

Signals the intent to check parity and provides a reusable utility function for evenness tests.

Even check

def is_even(n: int) -> bool: return n % 2 == 0