Loops

This documentation will guide you to get started quickly. In Python, loops are structures that allow you to execute a block of code repeatedly until a condition is met. There are two main types of loops: for and while. The for loop iterates over a sequence (like a list, tuple, or string), while the while loop executes code while a condition is true.

for

The for loop is ideal for iterating over the elements of a sequence (list, tuple, string, etc.).

loop.py

fruits = ['apple', 'banana', 'cherry']
for fruit in fruits:
    print(fruit)

# This code will print each fruit from the list.

while

The while loop executes a block of code while a condition is true.

loop.py

counter = 0
while counter < 10:
    print(counter)
    counter += 1

# Will print numbers from 0 to 9.

Caution

In while loops, it’s crucial to ensure that the condition can eventually become false to avoid infinite loops.

Key Differences

• for : Better for iterating over elements of a sequence when the number of iterations is known in advance.
• while : Better for executing a block of code while a condition is true, when the number of iterations is not known in advance.