Write a program two swap two numbers without using any third variable

Question

Take two numbers and swap them don't use any other variables

Answer 1

a = 10
b = 20
a, b = b, a
print(a, b)

#When dealing with expressions in python, everything to the right of the ‘=’ operator, i.e. the assignment operator, is evaluated first then assigned to the variables to the left.

Additionally, whenever you use a comma on the RHS, you’re telling python to create a tuple. Using a comma on the LHS tells python to unpack the tuple on the RHS into the variables on the LHS.

"Remember number of variable at LHS need to be equal to
length of tuple at RHS" or it will throw~
ValueError exception (too many values to unpack)
eg.
a, b = 10, 20 #Correct
a, b = 10, 20, 30 #Wrong
a, b, c = 10, 20, 30 #Correct
a, b = 10, (20, 30) #Correct"

Answer 2

Sorry for late answering but it may also help you
m = m + n
n = m - n
m = m - n
print(m , n)

Answer 3

You can use tuple packing to accomplish this.

Google or Bing it. It is also discussed in the python lessons here on Sololearn