# How to break a for loop in Python?

In Python normally for loops are constructed to iterate over a block for each item in a range. If a premature termination of loop is sought before all iterations are completed, then we can use break keyword. It is invariably used in a conditional statement inside the body of a loop.

## Using the break statement

Let’s take a few examples to see how the break statement works on for loops.

### Example

In this example the for loop is defined to iterate upto 20 loops, but the break statement terminates the for loop at 10th iteration i.e., x=10.

If we apply a break statement to the inner loop of a nested for loop then it will break only for that innermost loop. It doesn’t stop the entire loop.

for x in range(20):
print (x)
if x==10:
break
print ("end of loop")


### Output

0
1
2
3
4
5
6
7
8
9
10


### Example

In this example the inner loop stopped at i = 0 and j = 2 iteration so that the loop skipped the remaining 2 iterations (0, 3) and (0,4). We can use flag variable to stop the entire loop at particular iterations. Let’s see an example below.

for i in range(5):
for j in range(5):
print(i,j)
if i == 0 and j == 2:
print("stopping the inner loop at i = 0 and j = 2")
break


### Output

0 0
0 1
0 2
stopping the inner loop at i = 0 and j = 2
1 0
1 1
1 2
1 3
1 4
2 0
2 1
2 2
2 3
2 4
3 0
3 1
3 2
3 3
3 4
4 0
4 1
4 2
4 3
4 4



### Example

The flag variable terminated the nested loop at (0,2) iteration.

flag = False
for i in range(5):
for j in range(5):
print(i,j)
if i == 0 and j == 2:
print("stopping the loops at i = 0 and j = 2")
flag = True
break
if flag:
break


### Output

0 0
0 1
0 2
stopping the loops at i = 0 and j = 2



## Using the return statement

To break a for loop we can use return keyword, here we need to place the loop in a function. Using a return keyword can directly end the function.

### Example

The return keyword terminated the nested for loop at (0,2)th iteration.

def check():
for i in range(5):
for j in range(5):
print(i,j)
if i == 0 and j == 2:
return "stopping the loops at i = 0 and j = 2"

print(check())


### Output

0 0
0 1
0 2
stopping the loops at i = 0 and j = 2



Updated on: 23-Aug-2023

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