"""
Ex. 3.20 from "A Primer on...".
Write simple functions so that the listed function calls work
and give the expected result.
"""

def hw1():
    return "Hello, World!"

def hw2():
    print("Hello, World!")

def hw3(arg1, arg2):
    return arg1 + arg2

"""
The calls below are given in the question text, 
with the expected output in comments:
"""
print(hw1())
#Hello, World!
hw2()
#Hello, World!
print(hw3('Hello, ', 'World!'))
#Hello, World!
print(hw3('Python ', 'function'))
#Python function

"""
Terminal> python hw_func.py 
Hello, World!
Hello, World!
Hello, World!
Python function
"""