Getting started

What is a program?

  • A program is a sequence of instructions that tells how to solve a given problem. For example, Finding a square of a number.

Basic terminology of programming

  • Input: Get data from the keyboard, a file, or some other device.
  • Math: Perform basic mathematical operations like addition and multiplication.
  • Conditional execution: Check for certain conditions and execute the appropriate sequence of statements.
  • Repetition: Perform some action repeatedly, usually with some variation.
  • Output: Display data on the screen or send data to a file or other device.

Python installation

Before start programming in python, we have to install python software. To install python software go to https://www.python.org/downloads/ and download and install the python software which is compatible with your operating system.

Python program - "Hello World"

print("Hello World")
  • when we run the above code the python interpreter will give output Hello World.

Python Indentation

  • Indentation refers to the spaces at the beginning of a code line.
  • Python uses indentation to indicate a block of code.
  • Indentation improves the code readability

Python Comments

  • Comments are used to explain Python code.
  • Comments are used to make the code more readable.
  • Comments are used to prevent execution when testing code.
  • Comments starts with a #, and Python will ignore them:

Example:

#This is a comment
print("Hello, World!")