Modules, Comments & Pip (Session-2)

 Modules:

A module is a file containing code written by somebody else (usually) which can be imported and used in our programs.

Types of Modules:

There are two types of modules in Python:

• Built-in modules – Pre-installed in Python
• External modules – Need to install using pip

Pip:

Pip is a package manager for python. You can use pip to install a module on your system.

E.g., pip install flask (It will install flask module in your system).

Comments:

Comments are used to write something which the programmer does not want to execute.

Comments can be used to mark the author's name, date, etc.

Types of Comments:

There are two types of comments in python,

1. Single line comments – Written using # (pound/hash symbol)
2. Multi-line comments – Written using ‘’’ Comment ‘’’ or “”” Comment “””.

REPL:

 REPL stands for Read Evaluation Print Loop. We can use python as a calculator by typing “python” + TO DO on the terminal.

Now create a file:

hello.py and paste the below code into it.

print(“Hello World”)       Here Print is a function.

Practice Exercise 1:

1. Write a program to print any poem in python.
2. Use REPL and print the table of 5 using it.
3. Install an external module and use it to perform an operation of your interest.
4.  Search online for the function and Write a python program to print the contents of a directory using os module.
5. Label the program written in problem 4 with comments.
6. Use any 4 build-in modules.