Appendix B. Solutions to End-of-Part Exercises

Part I, Getting Started

See "Part I Exercises" in Chapter 3 for the exercises.

  1. Interaction. Assuming Python s configured properly, the interaction should look something like the following (you can run this any way you like (in IDLE, from a shell prompt, and so on):

    
    % python...copyright information lines...
    >>> "Hello World!"
    'Hello World!'
    >>>                     # Use Ctrl-D or Ctrl-Z to exit, or close window
  2. Programs. Your code (i.e., module) file module1.py and the operating system shell interactions should look like this:

    
    print 'Hello module world!'
    
    % python module1.py
    Hello module world!

    Again, feel free to run this other ways—by clicking the file’s icon, by using IDLE’s Run → Run Module menu option, and so on.

  3. Modules. The following interaction listing illustrates running a module file by importing it:

    
    % python
    >>> import module1
    Hello module world!
    >>>

    Remember that you will need to reload the module to run it again without stopping and restarting the interpreter. The question about moving the file to a different directory and importing it again is a trick question: if Python generates a module1.pyc file in the original directory, it uses that when you import ...

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