There are two loop statments in python.

  1. while
  2. for-in

while

  • Print the sequence 1, 5, 13, 29, … 8189.
num = 1
while num <= 8189:
  print(num)
  num = 2*num + 3

 

for-in

  • Print the sequence 3, 7, 11, 15, … 99.
for i in range(3, 100, 4):
  print(i)

 

Interview Questions

 

1. What are the three python keywords related to python loops?

  1. break
  2. continue
  3. else

 

2. When will else-block be excuted in a loop?

when no break occurs.

import random

for i in range(1, random.randint(5, 15)):
  if i > 10:
    break
  print(i)
else:
    print("Printed all the numbers!")