Swap two variables in Python

February 4, 2021

Swap two variables

Swapping two variables means swapping of the data stored in one variable to another variable and vice-versa. Swap two variables in Python can be done in many ways , few of them is using third variable , without using third variable , and by functions .
Lets see about swapping two variables by using third variable.

To see swapping of two variables without using third variable click here

Sample input: a=12 b=34
Sample output: a=34 b=12

Working of Swap two variables in Python

Step 1: Read first variable
Step 2: Read second variable
Step 3: Store data of first variable to some temporary variable
Step 4: Now move data of second variable to first variable
Step 5: We lost the data of first variable now as it is updated with another value. But we stored that in third variable
Step 6: Now move the data of third variable to second variable .
Step 7: Print data

Let a=12 and b=34
temp=a (temp=12)
a=b (a=34)
b=temp (b=12)

Python code:

# Swap two variables in Python
a=int(input(“Enter value : “))
b=int(input(“Enter value : “))
print(“Before swapping a :”,a)
print(“Before swapping b :”,b)
#logic to swap using third variable 
temp=a
a=b
b=temp
print(“After swapping a becomes :”,a)
print(“After swapping b becomes :”,b) 

Enter value : 12
Enter value : 34
Before swapping a : 12
Before swapping b : 34
After swapping a becomes : 34
After swapping b becomes : 12