mirror of https://github.com/python/cpython
bpo-25381: Update explanation of exceptions in C. (GH-26838)
* bpo-25381: Update explanation of exception globals This paragraph in extending/extending.rst was unchanged (except for NULL markup) since committed in 2007 Aug 15 for 2.6 alpha. * Respond to reviews and remove duplication. * Update Doc/extending/extending.rst Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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@ -127,13 +127,11 @@ Intermezzo: Errors and Exceptions
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An important convention throughout the Python interpreter is the following: when
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a function fails, it should set an exception condition and return an error value
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(usually a ``NULL`` pointer). Exceptions are stored in a static global variable
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inside the interpreter; if this variable is ``NULL`` no exception has occurred. A
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second global variable stores the "associated value" of the exception (the
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second argument to :keyword:`raise`). A third variable contains the stack
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traceback in case the error originated in Python code. These three variables
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are the C equivalents of the result in Python of :meth:`sys.exc_info` (see the
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section on module :mod:`sys` in the Python Library Reference). It is important
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(usually ``-1`` or a ``NULL`` pointer). Exception information is stored in
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three members of the interpreter's thread state. These are ``NULL`` if
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there is no exception. Otherwise they are the C equivalents of the members
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of the Python tuple returned by :meth:`sys.exc_info`. These are the
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exception type, exception instance, and a traceback object. It is important
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to know about them to understand how errors are passed around.
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The Python API defines a number of functions to set various types of exceptions.
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@ -0,0 +1,2 @@
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In the extending chapter of the extending doc, update a paragraph about the
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global variables containing exception information.
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