Nested Loops in Python

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A nested loop is a loop that runs inside another loop.  The outer loop has a set number of iterations, for each of these iterations the inner loop executes its iterations.

for x in range(3):
    for y in range(1, 11):
        print(y, end=" ")
    print() # <-- Start a new line Outer Loop

Exercise:

Write code to ask a user for the dimensions of a rectangle, then print it out using a user defined character.

Solution:

length = int(input("Enter the length of your rectangle: "))
width = int(input("Enter the width of your rectangle: "))
symbol = input("Enter the symbol to draw your rectangle: ")

for i in range(length):
    for j in range(width):
        print(symbol, end="")
    print()

Output:

Enter the length of your rectangle: 2
Enter the width of your rectangle: 40
Enter the symbol to draw your rectangle: #
########################################
########################################

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Recursion Simply Explained with Code Examples – Python for Beginners – (9m:06s)

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