Using Else Conditional Statement With For loop in Python
Last Updated :
13 Jul, 2022
Using else conditional statement with for loop in python
In most of the programming languages (C/C++, Java, etc), the use of else statement has been restricted with the if conditional statements. But Python also allows us to use the else condition with for loops.
The else block just after for/while is executed only when the loop is NOT terminated by a break statement.
Else block is executed in below Python 3.x program:
Python
for i in range(1, 4):
print(i)
else:
print("No Break")
|
Output :
1
2
3
No Break
Else block is NOT executed in Python 3.x or below:
Python
for i in range(1, 4):
print(i)
break
else:
print("No Break")
|
Output :
1
Such type of else is useful only if there is an if condition present inside the loop which somehow depends on the loop variable.
In the following example, the else statement will only be executed if no element of the array is even, i.e. if statement has not been executed for any iteration. Therefore for the array [1, 9, 8] the if is executed in the third iteration of the loop and hence the else present after the for loop is ignored. In the case of array [1, 3, 5] the if is not executed for any iteration and hence the else after the loop is executed.
Python
def contains_even_number(l):
for ele in l:
if ele % 2 == 0:
print ("list contains an even number")
break
else:
print ("list does not contain an even number")
print ("For List 1:")
contains_even_number([1, 9, 8])
print (" \nFor List 2:")
contains_even_number([1, 3, 5])
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Output:
For List 1:
list contains an even number
For List 2:
list does not contain an even number
As an exercise, predict the output of the following program.
Python
count = 0
while (count < 1):
count = count+1
print(count)
break
else:
print("No Break")
|
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