Learn Python Hello World Program

Learn Python Hello World Program – Introduction

Python is an easy-to-learn language with a straightforward syntax. It encourages programmers to write clean and readable code without unnecessary boilerplate. The simplest directive in Python is the print function, which outputs a line of text to the screen.

Python Versions – Learn Python Hello World Program

There are two major versions of Python: Python 2 and Python 3. They have significant differences, but Python 3 is preferred for new projects due to its improved semantics and newer features. Python 2 is gradually being phased out.

Printing in Python – Learn Python Hello World Program

One of the differences between Python 2 and Python 3 is the print statement. In Python 2, print is not a function and is used without parentheses. In Python 3, print is a function and requires parentheses.

Example:

print("This line will be printed.")

Python Indentation

Python uses indentation to define blocks of code, unlike languages like C that use curly braces. Both tabs and spaces are supported, but the standard indentation in Python is four spaces.

Example:

x = 3
if x == 3:
    # indented four spaces
    print("x is 3.")

Change the value of the variable x from 3 to another number. For example, change it to x = 9. When the if x == 3: statement is executed, it will be false, so nothing will be printed on the screen because x is not equal to 3.

More Examples and Practice

Let’s try a few more examples to understand how print and indentation work in Python.

Example 1: Simple Greeting

name = "Alice"
print("Hello, " + name + "!")

Example 2: Conditional Printing

age = 18
if age >= 18:
    print("You are an adult.")
else:
    print("You are a minor.")

Assignment

Try the following code examples on your own. Change the values of the variables and observe the output.

Task 1: Variable Change

1. Copy the code below.
2. Change the value of x from 3 to 5.
3. Run the code and see what gets printed.

x = 3
if x == 3:
    print("x is 3.")
else:
    print("x is not 3.")

Expected Output:

If you change x to 5, the output will be:

x is not 3.

Task 2: Personalized Greeting

1. Copy the code below.
2. Change the value of name to your own name.
3. Run the code and see the personalized greeting.

name = "Alice"
print("Hello, " + name + "!")

Expected Output:

If you change name to "John", the output will be:

Hello, John!

Conclusion

Python’s simplicity and readability make it an excellent choice for beginners and experienced programmers alike. Understanding the basics of printing and indentation will set a strong foundation for further learning.