Functions & basics
Reusable building blocks — parameters, returns, scope, and clear function design.
Mutual Recursion for Even/Odd Check in Python
Implements even and odd checks using two functions that call each other recursively, demonstrating base cases and alternating calls.
def is_even(n):
if n == 0:
return True
return is_odd(n - 1)
def is_odd(n):
if n == 0:
return False
return is_even(n - 1)
if __name__ == "__main__":
for num in range(0, 11):
print(f"{num}: even={is_even(num)}, odd={is_odd(num)}")Compound interest calculator in Python
Compute future investment value with the compound interest formula and a readable year-by-year loop.
def future_value(
principal: float,
annual_rate: float,
years: int,
compounds_per_year: int = 12,
) -> float:
"""Return balance after compound interest (rounded to cents)."""
rate_per_period = annual_rate / compounds_per_year
periods = compounds_per_year * years
amount = principal * (1 …Browse by section
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Functions & basics — Python code examples
What you will find here
This page collects functions & basics snippets — short, copy-ready Python you can paste into our free online IDE and run without installing anything. Each sample includes a plain-English explanation and the full source code.
Samples vs tutorials and challenges
Samples are quick reference — one concept per page. For step-by-step teaching, use our Python tutorials. To test yourself, try quizzes or coding challenges. Clean up style with the Python formatter.