What Is a Loop?
Imagine you want to print numbers from 1 to 10. Without a loop, you'd write:
print(1)
print(2)
print(3)

... all the way to 10

With a loop, you write it once and let Python do the work
The while Loop
A while loop keeps running as long as a condition is True.
Syntax
python while condition:
# code to repeat
Example 1 — Print 1 to 19
python
i = 1
while i < 20:
print(i)
i += 1
Output:
1
2
3
...
19
Breaking it down:

i = 1 → we start counting from 1
i < 20 → keep going as long as i is less than 20
i += 1 → increase i by 1 each time (so we don't loop forever!)
The for Loop
The for loop is Python's preferred way to repeat something a fixed number of times.
Syntax
python
for variable in sequence:
# code to repeat
Example — Print 1 to 10
python
for i in range(1, 11):
print(i)
Output:
1
2
3
...
10
range(1, 11) generates numbers from 1 up to (but not including) 11. So we get 1 through 10.
✅ Summary
A loop repeats code automatically.
A while loop runs as long as its condition is True.
A for loop is ideal when you know how many times to repeat.
Use range() with for loops to generate number sequences.
Wrap loops in functions to make them reusable.