"""
Exercise 7.10 from "A primer on...
Identify and implement the required 
special methods from the intended 
usage of the class.
"""

class Hello:
    def __init__(self):
        self.greeting = "Hello, "

    def __call__(self, arg):
        return self.greeting + arg + '!'
    
    def __str__(self):
        return self.greeting + 'World!'    

a = Hello()
print(a("students"))
#Hello, students!
print(a)
#Hello, World!

"""
Terminal> python Hello.py 
Hello, students!
Hello, World!
"""