http://en.wikipedia.org/wiki/Bytecode
Python source code is compiled into bytecode, the internal representation
of a Python program in the CPython interpreter. The bytecode is also
cached in .pyc and .pyo files so that executing the same file is
faster the second time (recompilation from source to bytecode can be
avoided). This “intermediate language” is said to run on a
virtual machine that executes the machine code corresponding to
each bytecode. Do note that bytecodes are not expected to work between
different Python virtual machines, nor to be stable between Python
releases.
(http://docs.python.org/glossary.html#term-bytecode)
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