method so it can be reused by the new extension dialog.

_PyErr_ChainExceptions() function.

_PyErr_ChainExceptions() function.

Initial patch by Mark Shannon.

Initial patch by Mark Shannon.

The correct parameter name is "fp", not "file".

The correct parameter name is "fp", not "file".

TODOs (mostly to do after add tests), and make a few other changes.

Remove the advice to never use relative imports; it is a leftover from 2.x implicit relative imports.
Remove the advice to locally import modules in __init__, it is a strange practice.
Remove the advice to use "from ... import *" with some modules.

Clean up the docs of PyObject_IsSubclass and PyObject_IsInstance, and mention that they call the PEP 3119 methods.