Writing and Running Your First Python Script

Creating a Python Script

1. Choose a text editor: Use a plain text editor like Notepad (Windows), TextEdit (macOS), or a dedicated code editor like Visual Studio Code, Sublime Text, or PyCharm.
2. Create a new file: Save the file with a .py extension (e.g., hello.py).
3. Write Python code: Inside the file, write your Python code.

Example:

Python

print("Hello, world!")

Running the Python Script

There are several ways to run a Python script:

1. Using the command line:
   • Open a terminal or command prompt.
   • Navigate to the directory containing the script.
   • Type python filename.py (replace filename.py with the actual file name) and press Enter.
2. Using an IDE:
   • Most IDEs have built-in options to run Python scripts. Check your IDE’s documentation for specific instructions.

Example Script

Python

# This script calculates the area of a circle

import math

radius = float(input("Enter the radius of the circle: "))
area = math.pi * radius * radius
print("The area of the circle is:", area)

Key Points

• Indentation: Python uses whitespace indentation to define code blocks.
• Comments: Use # for single-line comments and triple quotes (""") for multi-line comments.
• Variables: Assign values to variables using the equal sign (=).
• Input and Output: Use input() to get user input and print() to display output.
• Modules: Import modules using the import statement.

By following these steps and understanding the basic concepts, you can start writing and running Python scripts effectively.

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