Refactoring example with PyCharm

• Change variable name (in scope only)

def add(x, y):
    z = x + y
    return z

def multiply(x, y):
    z = x * y
    return z

x = 2
y = 3
z = add(x, y)
print(z)

z = multiply(x, y)
print(z)

• Extract method