Modules

Question 1

Write a code that will import a specific function add_numbers from a library adding_library?

Answer 1

import add_numbers from adding_library

Question 2

What are Python Modules?

Answer 2

At its core, a module is just a Python file with code in it. You can import entire files or specific functions from those files for use in other applications.

Question 3

How to create and use modules?

Answer 3

• Simply write the code you want and save it in a .py file.
• You can then use import to access functions in that file from other files by using the syntax from import

from <filename without the .py extension> import <function name>

Question 4

What is a possible complication from importing a lot of code?

Answer 4

Name Dublication
* Importing code further complicates things because you will be importing names into your code that maybe you would have wanted to use yourself.

Question 5

Explain Namespace

Answer 5

• System to help make the names of functions and variables unique
• Prevent duplication across modules and packages.

Python namespaces include the following:

• built-in namespace: contains all built-in functions and exceptions.
• global namespace: contains all the names of variables and functions you create in your program that exist outside of functions
  * local namespace: contains only names within a given function.

Question 6

Importing the floor function form the maths module, in which namespace would it be?

Answer 6

• Global Namespace

Question 7

How to avoid duplicate names?

Answer 7

• By importing entire library
• Variables and functions in library are now accessed with dot notation
• Now: having exported variable in own global namespace, thus eliminating conflict with library function of the same name

import math
math.floor(6.5)

Question 8

There is a function, my_function. Within that function, a variable called my_var is created. In which namespace does my_var exist?

Answer 8

• Local

Question 9

Python’s int( ) function will take an argument and convert it to an integer. In which namespace does int( ) exist?

Answer 9

Build-In

Question 10

How to improve documentation

Answer 10

• Properly named functions
• Informative comments

Question 11

What is a docstring and how to use it. Give example

Answer 11

def add_two_numbers(a, b):
    """ Adds two numbers together and returns the result. """

Or over various Lines

"""
text
tect
text
"""

Accessed like this

help(add_two_numbers)