Python break Keyword

The Python break keyword (statement) is used to terminate the program out of the loop containing it. If the break statement is used in a nested loop (loop inside loop), it will terminate innermost loop.

Break statement with While loop:

In the below example, break statement is used to get out of the while loop if the value of variable j becomes 5.

i=10
j=1
while (j < i):
    if (j == 5):
        break
    print(j)
    j = j + 1

The output of the above code will be:

1
2
3
4

Break statement with For loop:

Here, the break statement is used to get out of the for loop if the value of variable x becomes 'yellow'.

color = ['red', 'blue', 'green', 'yellow', 'black', 'white'] 
for x in color:
    if(x == 'yellow'):
        break
    print(x)

The output of the above code will be:

red
blue
green

Break statement with Nested loop:

In the below example, break statement terminates the inner loop whenever multiplier becomes 1000.

# nested loop without break statement	
digits = [1, 2, 3] 
multipliers = [10, 100, 1000]
for digit in digits:
    for multiplier in multipliers:
        print (digit * multiplier)

# nested loop with break statement	
digits = [1, 2, 3] 
multipliers = [10, 100, 1000]
for digit in digits:
    for multiplier in multipliers:
        if (multiplier == 1000):
            break
        print (digit * multiplier)

The output of the above code will be:

# output of nested loop without break statement
10
100
1000
20
200
2000
30
300
3000

# output of nested loop with break statement
10
100
20
200
30
300