Distance between two points!

[Turry]

Use exception handling to convert the user input to float.

This is the reason for the try/except
As for the problem itself.
You should make main function to take no arguments *since you get the coordonates from it*.
Inside main , put

print(distance(x1,y1,x2,y2))

Also , try to use only 1 method.
Either use math.sqrt or **1/2