🔄 Loops Statements

Last Updated: 14th August 2025

Loops let you repeat code without writing it again and again.

Hinglish Tip 🗣: Loop ka matlab — “jab tak kaam complete na ho, tab tak repeat.”

🛠 Types of Loops in Python

  1. for loop → iterate over a sequence (list, string, range, etc.)
  2. while loop → repeat as long as condition is True

1. while Loop

A while loop runs as long as the condition is true.

Syntax:

while condition:
    # repeat this block

Example:

i = 1
while i <= 5:
    print(i)
    i += 1

2. for Loop

A for loop is used for iterating over a sequence (that is either a list, a tuple, a dictionary, a set, or a string).

Hinglish Tip 🗣: For loop ka matlab — “sequence ke iteration.”

Syntax:

for item in sequence:
    # repeat this block

Example:

# Iterate over a String:
text = "ABC"
for ch in text:
    print(ch)

range function

The range() function returns a sequence of numbers, starting from 0 by default, and increments by 1 (by default), and ends at a specified number.

Syntax:

range(stop)              # 0 to stop-1
range(start, stop)       # start to stop-1
range(start, stop, step) # start to stop-1 with step

Hinglish Tip 🗣: Range ka matlab — “number ke sequence.”

# Iterate with range():
for i in range(5):
    print(i)

Nested Loops

Nested loops are loops inside loops.

Syntax:

# while
while condition:
    # repeat this block
    while condition:
        # repeat this block

# for
for item1 in sequence1:
    for item2 in sequence2:
        # repeat this block

# combined
for item1 in sequence1:
    while condition:
        # repeat this block

Example:

# while
i = 0
while i < 5:
    j = 0
    while j < 5:
        print(i, j)
        j += 1
    i += 1

# for
for i in range(5):
    for j in range(5):
        print(i, j)

# combined
for i in range(5):
    j = 0
    while j < 5:
        print(i, j)
        j += 1

else clause in loops

The else keyword in a loop specifies a block of code to be executed when the loop finishes without encountering a break statement. (We’ll see interaction with break in the next lesson on Jump Statements.)

Hinglish Tip 🗣: else tab chalti hai jab loop normally finish ho jaye (i.e., beech me stop na ho).

Syntax:

# while
while condition:
    # repeat this block
else:
    # code to run if no break

# for
for item in sequence:
    # repeat this block
else:
    # code to run if no break

Example:

# while
k = 1
while k <= 3:
    print(k)
    k = k + 1
else:
    print("Done")
# Output:
# 1
# 2
# 3
# Done

# for
for k in range(1, 4):
    print(k)
else:
    print("Done")

Hinglish Tip 🗣:Agar loop naturally khatam ho gaya, to else chalega.

💡 Quick Practice

  1. Exercises
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