stdin_example.py to read from standard input

Hey! 👋

The code you shared is designed to read input from standard input, typically used when you want your program to process input provided through the terminal or piped from another program.

Here’s how you can run it:

1. Save the code in a new Python file, for example, stdin_example.py:

   import sys
   for line in sys.stdin:
       if 'Exit' == line.rstrip():
           break
       print(f'Processing Message from sys.stdin {line}')
   print("Done")
   

2. Open your terminal and run the script:

   python3 stdin_example.py
   

   Now, you can type input directly. The script will keep processing your input until you type Exit and press Enter.

Let me know if that helps!

- Bobby

Heya,

If this functionality is a core part of your program, you can save the code in a separate Python file (e.g., stdin_reader.py) and run it independently. For example:

python stdin_reader.py

When running the script, you can then provide input to it via the terminal, piping, or redirection. For example:

• Typing input interactively in the terminal:

python stdin_reader.py

Then type:

Hello
World
Exit

Using a file as input:

cat input.txt | python stdin_reader.py

At the Beginning of Your Program

If processing input from stdin is an initial step in your program, you can place the code at the beginning of your main script. For example:

import sys

# Handle stdin input
for line in sys.stdin:
    if 'Exit' == line.rstrip():
        break
    print(f'Processing Message from sys.stdin *****{line}*****')
print("Done")

# Rest of your program logic
print("Starting main program logic...")
# Your program code here

This way, the input is processed first, and then the main logic of your program runs.

At the End of Your Program

If stdin processing is only needed after other parts of your program have executed, you can place it at the end of your script. For example:

# Other program logic
print("Performing some initial calculations...")
# Your program logic here

# Handle stdin input
import sys
for line in sys.stdin:
    if 'Exit' == line.rstrip():
        break
    print(f'Processing Message from sys.stdin *****{line}*****')
print("Done")

Integrated Into Your Program Logic

If the functionality is part of a larger program, you might want to modularize it into a function:

def process_stdin():
    import sys
    for line in sys.stdin:
        if 'Exit' == line.rstrip():
            break
        print(f'Processing Message from sys.stdin *****{line}*****')
    print("Done")

# Call the function where needed in your program
if __name__ == "__main__":
    # Example placement
    process_stdin()
    print("Continuing with the rest of the program...")

• Standalone script: If this is all your program does, save it in a file and run it independently.
• Beginning of the program: Use it first if the input is necessary for subsequent logic.
• End of the program: Use it last if you need it after all other logic has executed.
• Modularized function: Use this if you want flexibility to call it from anywhere in your program.