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Loop Statements in Python

Answer»

Loops in Python are statements that allow us to perform a certain operation multiple times unless some condition is met.

For Loops: For loop is used to iterate iterables like string, tuple, list, etc and perform some operation as shown in the flowchart below:


  • For with range:
    This loop format will iterate overall numbers from 0 to Limit - 1.
    The below example prints numbers from 0 to 4.
for i in range(5):
print(i)
Output:
0
1
2
3
4
  • For with range(start, stop, step):

   This will run the loop from start to stop - 1, with step size = step in each iteration.
   In the below example, the start is 2, end point is 10 and the step size is 2. Hence it prints 2,4,6,8

for i in range(2, 10, 2):
print(i)
Output:
2
4
6
8

  • For with in:
       This is used to iterate over all the elements in a python container like list, tuple, dictionary, etc.
a = [1, 3, 5, 7]
for ele in a:
print(ele)
Output:
1
3
5
7

  • While Loops:
    This is used for executing set of statements within its block as long as the associated loop condition is evaluated to True as shown in the image below:
>>> count = 5
>>> while count > 0:
... print(count)
... count -= 1
...
5
4
3
2
1


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