Python is a general-purpose, object-oriented programming language with high-level programming capabilities. It has become famous because of its apparent and easily understandable syntax, portability, and easy to learn.
Python is a programming language that includes features of C and Java. It provides the style of writing an elegant code like C, and for object-oriented programming, it offers classes and objects like Java.
Let’s write our very first python program.
Create a file called hello.py and paste the below code into it
print(“Hello World”) # print is a function (more later)
Execute this file (.py file) by typing python hello.py, and you will see Hello World printed on the screen.
A module is a file containing code written by somebody else (usually) which can be imported and used in our programs.
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)
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
Some examples of built-in modules are os, abc, etc.
Some examples of external modules are TensorFlow, flask, etc.
Using Python as a Calculator
We can use python as a calculator by typing “python” + TO DO on the terminal. [It opens REPL or read evaluation print loop]
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,
- Single line comments – Written using # (pound/hash symbol)
- Multi-line comments – Written using ‘’’ Comment ‘’’ or “”” Comment “””.
- Write a program to print Twinkle-Twinkle Little Star poem in python.
- Use REPL and print the table of 5 using it.
- Install an external module and use it to perform an operation of your interest.
- Write a python program to print the contents of a directory using os module. Search online for the function which does that.
- Label the program written in problem 4 with comments.