Python me For Loop kya hota hai?

For loop ka use tab hota hai jab hume kisi sequence ke har ek item par baar baar koi kaam karna ho — jaise list ke har element ko print karna, string ke har character ko check karna, ya kisi range me kaam karna. While loop me hum khud counter manage karte hain, lekin for loop automatic ek ek item par jaata hai.

Is page me yeh sab sikhenge :-

1. Basic for loop
2. range() function ke saath
3. String pe for loop
4. List, Tuple, Set pe for loop
5. Dictionary pe for loop
6. break aur continue
7. Nested for loop
8. for-else

Note :- For loop Python me kisi bhi iterable (list, string, tuple, dict, set, range) pe chal sakta hai. Har iteration me variable automatically next item le leta hai.

1. Basic For Loop

For loop ek sequence ke har ek item ko ek ek karke visit karta hai. Jab tak sequence me items hain, loop chalta rehta hai.

Syntax
for variable in sequence: # har iteration me variable ka value change hota hai

Example 1: List ke har element ko print karna

Python

In [1]:

fruits = ["apple", "banana", "mango", "grapes"]

for fruit in fruits:
    print(fruit)

print("Saare fruits print ho gaye!")

Output

Example 2: Numbers ki list — sum aur square nikalna

Python

In [1]:

numbers = [2, 4, 6, 8, 10]
total = 0

for n in numbers:
    total += n
    print(n, "ka square:", n ** 2)

print("Total sum:", total)

Output

2. range() Function ke saath For Loop

range() ek sequence of numbers generate karta hai. Isko for loop ke saath use karke hum kisi bhi range me numbers pe loop chala sakte hain.

Form	Matlab	Example
range(n)	0 se n-1 tak	range(5) → 0,1,2,3,4
range(start, stop)	start se stop-1 tak	range(2,6) → 2,3,4,5
range(start, stop, step)	step se badhte hue	range(0,10,2) → 0,2,4,6,8

Example 1: range(n) — 0 se shuru

Python

In [1]:

for i in range(5):
    print(i)        # 0, 1, 2, 3, 4 — 5 nahi aayega!

Output

Example 2: range(start, stop) — custom range

Python

In [1]:

print("1 se 10 tak:")
for i in range(1, 11):   # 1 se shuru, 11 se pehle band
    print(i, end=" ")

print()  # naya line

print("5 se 15 tak:")
for i in range(5, 16):
    print(i, end=" ")

Output

Example 3: range(start, stop, step) — step ke saath

Python

In [1]:

print("Sirf even numbers (0-20):")
for i in range(0, 21, 2):   # 2-2 karke badhna
    print(i, end=" ")

print()

print("Ulti ginti (10 se 1):")
for i in range(10, 0, -1):  # -1 step = ulti ginti
    print(i, end=" ")

Output

3. String pe For Loop

String bhi ek sequence hai — characters ka sequence. For loop string ke har ek character par ek baar jaata hai.

Example 1: String ke har character ko print karna

Python

In [1]:

name = "Python"

for char in name:
    print(char)

Output

Example 2: Vowels count karna string me

Python

In [1]:

word = "programming"
vowels = "aeiou"
count = 0

for char in word:
    if char in vowels:
        count += 1
        print(char, "vowel hai")

print("Total vowels in", word, ":", count)

Output

4. List, Tuple aur Set pe For Loop

For loop teeno pe same tarike se kaam karta hai — har item pe ek baar jaata hai. Saath me enumerate() se index bhi mil sakti hai.

Example 1: enumerate() — index aur value dono saath

Python

In [1]:

students = ["Ravi", "Priya", "Arjun", "Neha"]

# enumerate() - index aur value dono milti hai
for index, name in enumerate(students):
    print(f"Roll No {index + 1}: {name}")

Output

Example 2: Tuple pe for loop

Python

In [1]:

colors = ("red", "green", "blue", "yellow")

for color in colors:
    print("Color:", color)

# Set pe bhi same tarah kaam karta hai
unique_nums = {10, 20, 30, 40}
print("\nSet ke numbers:")
for num in unique_nums:
    print(num)

Output

5. Dictionary pe For Loop

Dictionary pe for loop chalane ke 3 tarike hain — sirf keys, sirf values, ya dono saath (items).

Example 1: Sirf keys aur sirf values

Python

In [1]:

student = {"name": "Rahul", "age": 20, "city": "Mumbai"}

print("Keys:")
for key in student:          # by default keys milti hain
    print(key)

print("\nValues:")
for value in student.values():
    print(value)

Output

Example 2: items() — key aur value dono saath

Python

In [1]:

marks = {"Maths": 92, "Science": 87, "English": 78, "Hindi": 95}

print("Subject-wise marks:")
for subject, score in marks.items():
    print(f"  {subject}: {score}")

Output

6. break aur continue For Loop me

While loop ki tarah for loop me bhi break aur continue use kar sakte hain — bilkul same kaam karte hain.

Example 1: break — target milte hi loop band karo

Python

In [1]:

items = ["pen", "book", "mango", "eraser", "sharpener"]

print("Fruits dhundh rahe hain:")
for item in items:
    if item == "mango":
        print("Mango mil gaya! Search band.")
        break
    print(item, "- fruit nahi")

Output

Example 2: continue — negative numbers skip karo

Python

In [1]:

numbers = [4, -2, 7, -5, 10, -1, 3]

print("Sirf positive numbers:")
for n in numbers:
    if n < 0:
        continue    # negative hai? skip!
    print(n)

Output

7. Nested For Loop

Ek for loop ke andar doosra for loop — isse Nested for loop kehte hain. Outer loop ek baar chalega, aur har baar outer loop ke saath inner loop poora chalta hai.

Example 1: 2 se 4 tak pahada — nested loop se

Python

In [1]:

for i in range(2, 5):        # outer loop: 2, 3, 4
    print(f"\n--- {i} ka Pahada ---")
    for j in range(1, 11):   # inner loop: 1 se 10
        print(f"{i} x {j} = {i * j}")

Output

Example 2: Star pattern banana nested loop se

Python

In [1]:

rows = 5

for i in range(1, rows + 1):       # outer: row number
    for j in range(i):              # inner: us row me kitne stars
        print("*", end=" ")
    print()   # naya line har row ke baad

Output

8. for-else Statement

Bilkul while-else ki tarah, for loop ke saath bhi else likh sakte hain. else tab chalta hai jab loop normally khatam ho — yaani bina break ke. Agar break se loop band hua toh else nahi chalega.

Example 1: List me koi item hai ya nahi — for-else se check

Python

In [1]:

items = ["chai", "samosa", "lassi", "paratha"]
search = "pizza"

for item in items:
    if item == search:
        print(search, "mil gaya!")
        break
else:
    # loop bina break ke khatam hua — matlab item nahi mila
    print(search, "list me nahi hai!")

Output

Example 2: Prime number check — for-else se

Python

In [1]:

num = 17

for i in range(2, num):
    if num % i == 0:
        print(num, "prime nahi hai —", i, "se divide hota hai")
        break
else:
    # koi divisor nahi mila — prime hai!
    print(num, "ek Prime number hai!")

Output

Quick Summary — for loop ek nazar me

Concept	Kaam	Example
for in	Sequence ke har item par loop	for x in list:
range()	Number sequence generate karna	for i in range(1,11):
enumerate()	Index + value dono saath	for i, v in enumerate(lst):
items()	Dict me key + value dono	for k, v in d.items():
break	Loop beech me rokna	if x == 5: break
continue	Ek step skip karna	if x < 0: continue
Nested for	Loop ke andar loop	for i: for j:
for-else	Loop bina break khatam ho toh else	for ...: ... else: ...

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