Answer 1

For more info check the official documentation
https://docs.python.org/3/tutorial/modules.html

Answer 2

@Lunar you're right. updated the URL.

Answer 3

just create a file with the module name:
eg. module.py

then import it in any other program:
eg. import module

Answer 4

@Ranjan
May I suggest using Python 3 docs next time? Just change the '2' in the URL to a '3' and it'll be more up to date.

Answer 5

And in Ruby.

Answer 6

it is easy to implement then java or any other languages

Answer 7

is python is easy to understand or learn or very difficult.