question24.py

'''
Question 24
Level 1

Question:
    Python has many built-in functions, and if you do not know how to use it, you can read document online or find some books. But Python has a built-in document function for every built-in functions.
    Please write a program to print some Python built-in functions documents, such as abs(), int(), raw_input()
    And add document for your own function

Hints:
    The built-in document method is __doc__
'''

print(input.__doc__)  # default doc for input method


def square(num):
    '''
    :param num: number to be squared
    :return: squared integer value

    Return the square value of the input number.
    Input number must be an integer.
    '''

    return num ** 2


print(square(2))
print(square.__doc__)