param_args.py

def foo(x):                 # x is a function parameter
    print("x = " + str(x))

foo(5)   # pass 5 to foo(). Here 5 is an argument passed to function foo.

def square(x):  # Define a function that prints the square of the passed parameter.
    print(x ** 2)

square(4)
square(8)
square(15)
square(23)
square(42)

산출물 (Output)

x = 5
16
64
225
529
1764

* Function parameters are defined inside the parentheses (), following the function name.
A parameter acts as a variable name for the passed argument.