Take values of length and breadth of a rectangle from user and check if it is square or not.

Sure, here is a step-by-step guide on how to do this:

1. First, you need to ask the user to input the length and breadth of the rectangle. In Python, you can use the input() function for this.

length = float(input("Enter the length of the rectangle: "))
breadth = float(input("Enter the breadth of the rectangle: "))

2. Next, you need to check if the length and breadth are equal. If they are, then the rectangle is a square. If they are not, then the rectangle is not a square. You can use an if statement to do this.

if length == breadth:
    print("This is a square.")
else:
    print("This is not a square.")

3. That's it! When you run this program, it will ask the user to input the length and breadth of a rectangle, and then it will tell them whether or not the rectangle is a square.