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The original checkin used EnvironmentError in both
the documentation and the docstrings, so this is not
a result of some accidental editing.  Since a good
documentation policy for a portable language is to
document intended usage, not implementation artifacts,
you should at least check with the original authors
before you make the documentation depend on the current
CPython implementation.

(and no, using EnvironmentError is an entirely different
thing than using Exception.  Can we keep the hyperbolic
arguments on comp.lang.python, please?)