"""
Ex 7.10 from A Primer on ...
"""

class Hello:
    def __call__(self,text):
        return 'Hello, ' + text + '!'

    def __str__(self):
        return 'Hello world!'

"""
Class usage:
"""
a = Hello()
print(a('students'))
print(a)

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