Absolute Beginner's Python Programming Full Color Guide with Lab Exercises by Kevin Wilson

Author:Kevin Wilson
Language: eng
Format: epub
Publisher: Elluminet Press
Published: 2023-05-12T10:10:03+00:00

A variable created in the main body of the Python code is a global variable and belongs to the global scope. Global variables are available from within any scope, global and local.

The period in which a variable exists in memory is called its lifetime.

Variables defined inside a function exist only while the function executes. Once the function returns, the variables inside the function are destroyed.

Recursion

A recursive function is a function that can call itself. This enables the function to repeat itself several times.

Open the file recursion1.py. Here we have a recursive function that calculates the factorial of a number. Remember, to calculate the factorial you multiply all the numbers from 1 to the given number.

def factorial(n):

if n <= 1:

return 1

else:

return n * factorial(n-1)

When we call the factorial function and pass a positive integer (n)

factorial(4)

It will recursively call itself by decreasing the number passed to the function (n) by one each time, then add the call to a call stack.

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