Python for Loop: while & for loop with example

In computer science, a loop is a programming structure that repeats a sequence of instructions until a specific condition is met. Programmers use loops to cycle through values, add sums of numbers, repeat functions, and many other things.

Loops are supported by all modern programming languages, though their implementations and syntax may differ. Two of the most common types of loops are the while loop and the for loop.

Python Loops

Python has two primitive loop commands:

• while loops
• for loops

Python while Loop

A while loop is the simplest form of a programming loop. It states that while a condition is valid, keep looping

With the while loop we can execute a set of statements as long as a condition is true.

Example

Print i as long as i is less than 6:

i = 1
while i < 6:
  print(i)
  i = i + 1

Note: remember to increment i, or else the loop will continue forever.

Python For Loop

Example

Print each name in a name list:

name = ["one", "two", "three"]
for x in name:
  print(x)

Looping Through a String

for x in "banana":
  print(x)