text: This directory contains SymPy example programs.
  
  -------------------------------------------------------------------------------
  DIRECTORY STRUCTURE
  
  The examples are broken up into three categories based on difficulty of both
  the mathematics and programming concepts.  They roughly follow the following
  guide:
  
  beginner :
    Simple examples appropriate for first steps in using SymPy, for someone
    with little or no programming experience.
  
  intermediate :
    Demonstrations of more complex mathematical concepts, but still for
    someone with little programming experience.
  
  advanced :
    Larger demonstrations of advanced mathematical topics.
  
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  RUNNING EXAMPLES
  
  All the working examples can be run by executing the "all.py" script, use
  ./all.py -h for usage, if an example is known to be broken it will be commented
  out in this script.
  
  To run the individual examples one needs to have Python version >= 2.6
  installed and SymPy must be in your PYTHONPATH environment variable.  Most
  examples can be run from the command line python and the name of the example:
  
    aterrel@lilac:~/sympy/examples$ export PYTHONPATH=$PWD/..:$PYTHONPATH
    aterrel@lilac:~/sympy/examples$ python beginner/basic.py
    (3*a*b**2)**c
  
  Note: on most systems, the current directory is searched by Python
  automatically, so "python beginner/basic.py" works from the sympy root
  directory, however there are systems (Ubuntu Intrepid) where this doesn't work
  by default, unless you put "PYTHONPATH=." into your .bashrc for example.
  