Ivan Pozdeev <[email protected]> added the comment:
Oh, I see, you want to be able to get the source for code entered into the
interactive session.
IPython does this by creating a separate fake "file name" for every input and
adding corresponding entries for them into `linecache.cache'. This doesn't work
for classes 'cuz for them, inspect.getfile() rather looks at
__module__.__file__ , and there's no single __file__ for __main__.
Now, there are two concerns here:
* This will lead to linecache being polluted with old input, effectively a
memory leak. Unlike vanilla's readline cache which has a maximum length. Not
much concern for IPython which only needs to be good enough for its target
audience and can be dropped if it doesn't work for a specific scenario. But not
for vanilla which needs to work reliably in all cases.
* There indeed is a discrepancy between functions that link to source directly
and classes that rely on heuristics for that (inspect.findsource() searches the
file with a regex for the class' definition, how absurd is that?). Adding
__file__ and __firstlineno__ _could_ help here, the `class' directive will need
to add them.
* In any case, the returned source is prone to "not necessarily what the
interpreter uses", but that's the problem with how the returned source is
generated, not where it's taken from.
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<https://bugs.python.org/issue33826>
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