Python sys Module Programs with Solutions

20 sys module programs: command-line arguments, exit codes, stdin/stdout/stderr, the module search path, version checks, recursion limits and object sizes. Programs that need arguments run a small helper script so you can see real results.

All programs

• #1Read command-line arguments
  Write a Python program that prints its command-line arguments.Easy
• #2Sum numbers from the command line
  Write a Python program that adds the numbers passed as arguments.Easy
• #3Exit with a status code
  Write a Python program that exits with code 1 on failure and show the code the caller sees.Easy
• #4Check the Python version
  Write a Python program that checks it is running on Python 3.10 or newer.Easy
• #5Detect the operating system
  Write a Python program that prints a different message per operating system.Easy
• #6Write errors to stderr
  Write a Python program that writes normal output to stdout and errors to stderr.Easy
• #7Read numbers from stdin
  Write a Python program that reads numbers from standard input and prints their total.Easy
• #8Write with sys.stdout
  Write a Python program that prints a progress bar with sys.stdout.write.Easy
• #9Inspect sys.path
  Write a Python program that shows how many folders Python searches for modules.Easy
• #10Import from a custom folder
  Write a Python program that adds a folder to sys.path and imports a module from it.Medium
• #11Which modules are loaded?
  Write a Python program that checks whether a module has been imported yet.Easy
• #12Size of objects
  Write a Python program that compares the memory size of a few objects.Easy
• #13Recursion limit
  Write a Python program that reads the recursion limit and handles RecursionError.Easy
• #14Largest list index
  Write a Python program that prints sys.maxsize and shows ints can be bigger.Easy
• #15Float limits
  Write a Python program that prints the largest float and float precision.Easy
• #16Which Python is running?
  Write a Python program that checks which interpreter file is running.Easy
• #17Byte order and encoding
  Write a Python program that prints the machine’s byte order and the default text encoding.Easy
• #18Exit with a message
  Write a Python program that stops with a message when a required file is missing.Easy
• #19Arguments with argparse
  Write a Python program that parses named options with argparse.Medium
• #20Current exception info
  Write a Python program that reads the active exception with sys.exception().Easy