What is a Function?
A function is a reusable block of code that performs a specific task. You define it once with def and call it whenever you need it.
Basic Function
def greet(name):
return "Hello, " + name + "!"
print(greet("Alice"))Function with Return Value
Use return to send a result back to the caller.
def add(a, b):
return a + b
result = add(5, 3)
print(result)Docstrings
A docstring describes what the function does. It goes right after the def line.
def square(n):
"""Return the square of a number."""
return n * n
print(square(4))
print(square.__doc__)