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Most of Python, and its docs, were written before C89 
("Standard C") was required.  const is used sporadically as a 
result, mostly just in newer code and docs.

Changing examples to use const char * should be fine, as 
that is best C practice.  Just make sure the examples still 
work <wink -- but sticking "const" in has a way of 
propagating; e.g., once you have a const char *, you can't 
pass it directly to a function taking a (non-const) char * 
argument anymore>.