Include Python API files in distributions.

examples/python/example.py

@@ -1,4 +1,30 @@
-# Copyright (c) Microsoft Corporation 2015
+# Copyright (c) Microsoft Corporation 2015, 2016
+
+# The Z3 Python API requires libz3.dll/.so/.dylib in the 
+# PATH/LD_LIBRARY_PATH/DYLD_LIBRARY_PATH
+# environment variable and the PYTHON_PATH environment variable
+# needs to point to the `python' directory that contains `z3/z3.py'
+# (which is at bin/python in our binary releases).
+
+# If you obtained example.py as part of our binary release zip files,
+# which you unzipped into a directory called `MYZ3', then follow these
+# instructions to run the example:
+
+# Running this example on Windows:
+# set PATH=%PATH%;MYZ3\bin
+# set PYTHONPATH=MYZ3\bin\python
+# python example.py
+
+# Running this example on Linux:
+# export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:MYZ3/bin
+# export PYTHONPATH=MYZ3/bin/python
+# python example.py
+
+# Running this example on OSX:
+# export DYLD_LIBRARY_PATH=$DYLD_LIBRARY_PATH:MYZ3/bin
+# export PYTHONPATH=MYZ3/bin/python
+# python example.py
+
 
 from z3 import *