DEV Community

Cover image for Python for Beginners (Part 1): From Zero to Writing Your First Programs
Victor Karanja
Victor Karanja

Posted on

Python for Beginners (Part 1): From Zero to Writing Your First Programs

#python #beginners #tutorial #programming

Python for Beginners (Part 1): From Zero to Writing Your First Programs

Python is one of the most beginner-friendly programming languages in the world. Whether you want to become a data analyst, data scientist, backend developer, automation engineer, or AI engineer, Python is an excellent place to start.

In this first part of the series, you'll learn the fundamentals you need before moving on to decision-making, loops, and functions in Part 2.

Why Learn Python?

Python is known for its simple syntax, making it easy to read and write. It is used in many fields, including:

  • Data Analysis
  • Artificial Intelligence and Machine Learning
  • Web Development
  • Automation
  • Cybersecurity
  • Scientific Computing

If you've never written code before, don't worry. We'll take it one step at a time.

Installing Python

Download the latest version of Python from the official website.

During installation on Windows, remember to check "Add Python to PATH" before clicking Install Now.

To verify your installation, open a terminal and type:

python --version
Enter fullscreen mode Exit fullscreen mode

or

python3 --version
Enter fullscreen mode Exit fullscreen mode

If Python is installed correctly, you'll see the installed version number.

Writing Your First Program

Let's start with the classic program.

print("Hello, World!")
Enter fullscreen mode Exit fullscreen mode

Output:

Hello, World!
Enter fullscreen mode Exit fullscreen mode

Congratulations! You've written your first Python program.

Variables

Variables store information that your program can use later.

name = "Alice"
age = 22
height = 1.68
Enter fullscreen mode Exit fullscreen mode

You can display them using print().

print(name)
print(age)
print(height)
Enter fullscreen mode Exit fullscreen mode

Common Data Types

Python has several built-in data types.

name = "Alice"      # String
age = 22            # Integer
height = 1.68       # Float
is_student = True   # Boolean
Enter fullscreen mode Exit fullscreen mode

Understanding data types helps you write reliable programs and avoid common mistakes.

Getting User Input

Programs become more useful when they interact with users.

name = input("Enter your name: ")

print("Hello,", name)
Enter fullscreen mode Exit fullscreen mode

Example output:

Enter your name: Victor
Hello, Victor
Enter fullscreen mode Exit fullscreen mode

Basic Operators

Python supports arithmetic operators.

a = 20
b = 5

print(a + b)
print(a - b)
print(a * b)
print(a / b)
Enter fullscreen mode Exit fullscreen mode

You can also calculate remainders using %.

print(20 % 3)
Enter fullscreen mode Exit fullscreen mode

Output:

2
Enter fullscreen mode Exit fullscreen mode

Writing Comments

Comments explain your code and are ignored by Python.

# This is a comment

name = "Alice"
Enter fullscreen mode Exit fullscreen mode

Comments make your code easier for you and others to understand.

Summary

By completing this article, you've learned how to:

  • Install Python
  • Write your first program
  • Create variables
  • Work with common data types
  • Accept user input
  • Perform basic calculations
  • Write comments

These are the building blocks you'll use in almost every Python program.

What's Next?

In Part 2, we'll make our programs smarter by learning:

  • Comparison operators
  • if, elif, and else
  • for and while loops
  • Functions
  • Lists
  • Dictionaries

Happy coding, and see you in Part 2!

https://dev.to/victak36lgtm/python-for-beginners-part-2-mastering-python-fundamentals-4i6n

Top comments (0)