Brief Overview Chapter of Python | Class 11 Informatics Practices Notes

3.8 INPUT AND OUTPUT

Input and output operations allow a Python program to interact with the user. The input() function is used to take input from the user via the keyboard. It optionally accepts a prompt string displayed to the user before input. The input() function always returns the user input as a string, regardless of whether the input is numeric or alphabetic. To convert the input string to another data type, such as integer or float, conversion functions like int() or float() are used. For example, age = int(input("Enter your age:")) converts the input to an integer. If the input cannot be converted (e.g., entering alphabets when expecting a number), an error occurs. For output, Python uses the print() function, which displays values or expressions on the screen. The print() function can take multiple arguments separated by commas, which are printed with spaces in between. It evaluates expressions before displaying them. Input and output functions are fundamental for creating interactive programs that accept user data and display results.

📊 Diagram: No specific diagram, but examples show input prompts and output display.

🧪 Activity: Examples 3.8 to 3.10 demonstrate input and output usage.

🔗 Connection: Leads to debugging, which helps identify and fix errors in input/output and other code.