LOOPS

LOOPS IN PYTHON

By Tempa Rinchen

Types of Loops in Python

Python has two types of loops:

• while loop

• for loop

  Both loops help in repeating a block of code

while Loop – Basics

i = 1

while i < 6:

print(i)

i += 1

-Repeats as long as the condition is true
- Don’t forget to increment or modify the loop variable, or it becomes an infinite loop

while Loop – break

i = 1

while i < 6:

print(i)

if i == 3:

break

i += 1


- break exits the loop even if the condition is still true

while Loop – continue

i = 0

while i < 6:

i += 1

if i == 3:

continue

print(i)

Skips the current iteration when i == 3, then continues

For Loop

for x in range(6):

print(x)






- A for loop is used for iterating over a sequence (list,tuple,strings)
- Generates a sequence: 0 to 5 (not including 6)

​fruits = ["apple", "banana", "cherry"]
for x in fruits:
  print(x)

For Loop - break statement

fruits = ["apple", "banana", "cherry"]
for x in fruits:
  print(x)
  if x == "banana":
    break


Exit the loop when x is "banana"

For Loop - continue statement

fruits = ["apple", "banana", "cherry"]
for x in fruits:
  if x == "banana":
    continue
  print(x)


Exit the loop when x is "banana"

Using for & while loop in Turtle

from turtle import*
fd(100)
rt(90)
fd(100)
rt(90)
fd(100)
rt(90)
fd(100)

​from turtle import*
for i in range(4):
fd(100)
rt(90)

Activity

Sonam wants to generate multiplication table of 1, 2 and 3 upto 10 using nested while loop. Write the code

Multiple Choice

What is the purpose of a while loop in Python?

• To iterate over a sequence of items

• To define a function

• To execute a set of statements as long as a condition is true

• To create a list

Multiple Choice

What will happen if you forget to increment the variable in a while loop?

• The loop will continue forever

• The loop will execute twice

• The loop will execute only once

• The program will crash

Multiple Choice

What does the break statement do in a loop?

• It pauses the loop

• It skips the current iteration

• It stops the loop immediately

• It restarts the loop

Multiple Choice

What will the following code print? fruits = ['apple', 'banana', 'cherry']; for x in fruits: print(x)

• apple banana cherry

• banana cherry apple

• cherry banana apple

• apple, banana, cherry

Multiple Choice

What is the purpose of the continue statement in a loop?

• To skip the current iteration and continue with the next

• To stop the loop completely

• To exit the loop if a condition is met

• To restart the loop from the beginning

Multiple Choice

Which of the following is NOT a type of loop in Python?

• while loop

• for loop

• nested loop

• do-while loop

Multiple Choice

How do you define a for loop in Python?

• for each item in sequence:

• for item = sequence:

• for (item in sequence):

• for item in sequence:

Multiple Choice

What will the following code print? fruits = ['apple', 'banana', 'cherry']; for x in fruits: print(x)

• apple banana cherry

• banana cherry apple

• cherry banana apple

• apple, banana, cherry

Multiple Choice

What will the following code output? for x in 'banana': print(x)

• b a n a n a

• b a n

• banana

• b, a, n, a, n, a

Multiple Choice

What does the following code do? for x in fruits: if x == 'banana': break

• It prints all fruits

• It skips 'banana' and prints the rest

• It stops the loop when 'banana' is found

• It prints 'banana' only

Multiple Choice

What will the following code output? for x in 'banana': print(x)

• b a n a n a

• b a n

• banana

• b, a, n, a, n, a

Multiple Choice

What will happen if you use continue when x is 'banana' in the following code? for x in fruits: if x == 'banana': continue; print(x)

• It will print 'banana'

• It will skip 'banana' and print the rest

• It will print nothing

• It will cause an error