import sys

# Read input from stdin
user_input = sys.stdin.read()
print("Input received:", user_input)

stdout (Standard Output):

Purpose: stdout is used for sending output from a program. It typically displays information to the console or terminal.

Typical Usage: Printing results, messages, or data to the screen or redirecting output to files or other programs.

 Example in Python:

import sys

# Write output to stdout
sys.stdout.write("Hello, World!\n")

stderr (Standard Error):

Purpose: stderr is used for outputting error messages and diagnostics. It allows a program to report errors separately from standard output.

Typical Usage: Displaying error messages, debugging information, or warnings. stderr is often used for logging errors while keeping stdout clean for regular output.

Example in Python

import sys

# Write error message to stderr
sys.stderr.write("An error occurred!\n")

Solution on AskFullStack

The developer described their confusion on AskFullStack, seeking help to understand and effectively use stdin, stdout, and stderr. The community provided a comprehensive explanation and examples, addressing the developer’s concerns.

Clarify Stream Purposes:

Standard Input (stdin): Used to receive input data.

Standard Output (stdout): Used to display or write output data.

Standard Error (stderr): Used to display or write error messages.

Provide Practical Examples:

Example with Command-Line Arguments:

# Command to provide input and get output
echo "Input text" | python script.py

In script.py: