Python has many built-in functions, and if you do not know how to use it, you can read documents online or find some books. But Python has a built-in document function for every built-in function.
Please write a program to print some Python built-in functions documents, such as abs(), int(), raw_input().
And add a document for your own function.
The built-in document method is doc
defsquare(num):'''Return the square value of the input number. The input number must be integer. '''return num ** 2print square(2)