Question

I’m using Windows XP.

When I double click the Launch_PyDemos.pyw from the book Programming Python, nothing happens. When I try to run Launch_PyDemos.pyw from command-line, I get the error message:

Traceback (most recent call last):
  File "PyDemos2.pyw", line 41, in <module>
    from PP3E.Gui.Tools.windows import MainWindow    # a Tk with icon, title, quit
ImportError: No module named PP3E.Gui.Tools.windows

When I set the PythonPath enviroment variable to the PP3E folder, nothing happens. When I append the PP3E folder to the Path enviroment variable, nothing happens. When I copy the PP3E directory tree to the site-packages folder in your Python source library, nothing happens.

What is going on?

Answer 1

You’re missing libraries from the book. Quoting a bytes thread:

Please follow the instructions on the
book, or read the README-PP3E.txt
file; below I copy the most relevant
parts:

“””Copy the entire PP3E directory tree
to some directory on your computer,
and add the name of the directory
containing PP3E to your module search
path (i.e., you PYTHONPATH shell
setting, “.pth” files, etc.).

Alternatively, copy the PP3E directory
tree to the site-packages folder in
your Python source library (e.g.,
C:\Python24\Lib\site-packages on
Windows for Python 2.4). Because this
directory is automatically searched on
imports, copying here makes PYTHONPATH
settings unnecessary.”””

Also, make sure you get the updated
version from
http://examples.oreilly.com/python3/pp3e-updates.html