Appendix B. Solutions to End-of-Part Exercises

Part I, Getting Started

See Test Your Knowledge: Part I Exercises in Chapter 3 for the exercises.

  1. Interaction. Assuming Python is 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 and the operating system shell interactions should look like this:

    print('Hello module world!')
    % python
    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 the module, even if the source code (.py) file has been moved to a directory not in Python’s search path. The .pyc file is written automatically if Python has access to the source file’s directory; it contains the compiled byte code version of a module. See Chapter 3 for more on ...

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