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https://github.com/python/cpython
09 December 2020, 11:06:31 UTC
Revision e99c99389c582b08a648d7f17823b2cce74e8842 authored by Michael W. Hudson on 25 March 2002, 13:21:41 UTC, committed by Michael W. Hudson on 25 March 2002, 13:21:41 UTC 
backport tim_one's checkin of
 
    revision 2.55 of complexobject.c

SF bug 533198:  Complex power underflow raises exception.
Konrad was too kind.  Not only did it raise an exception, the specific
exception it raised made no sense.  These are old bugs in complex_pow()
and friends:

1. Raising 0 to a negative power isn't a range error, it's a domain
   error, so changed c_pow() to set errno to EDOM in that case instead
   of ERANGE.

2. Changed complex_pow() to:

A. Used the Py_ADJUST_ERANGE2 macro to try to clear errno of a spurious
   ERANGE error due to underflow in the libm pow() called by c_pow().

B. Produced different exceptions depending on the errno value:
   i) For errno==EDOM, raise ZeroDivisionError instead of ValueError.
      This is for consistency with the non-complex cases 0.0**-2 and
      0**-2 and 0L**-2.
   ii) For errno==ERANGE, raise OverflowError.

Bugfix candidate.
1 parent 777f143
History
Tip revision: e99c99389c582b08a648d7f17823b2cce74e8842 authored by Michael W. Hudson on 25 March 2002, 13:21:41 UTC
backport tim_one's checkin of
Tip revision: e99c993
File Mode Size
Modules
Python
support
Makefile -rw-r--r-- 13.9 KB
README -rw-r--r-- 1.2 KB
pyconfig.h -rw-r--r-- 18.8 KB
sleep.c -rw-r--r-- 857 bytes
unixstuff.c -rw-r--r-- 1.7 KB
unixstuff.h -rw-r--r-- 318 bytes

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