Terry J. Reedy <[email protected]> added the comment:
I think this should have been first floated on python-ideas list. One
objection is the same as for eliminating tail calls in general: it collapses
tracebacks.
def g1():
yield from g2()
def g2():
yield 1/0
for i in g1(): pass
Traceback (most recent call last):
File "F:\Python\a\tem.py", line 7, in <module>
for i in g1(): pass
File "F:\Python\a\tem.py", line 2, in g1
yield from g2()
File "F:\Python\a\tem.py", line 5, in g2
yield 1/0
ZeroDivisionError: division by zero
There was at least some discussion of making 'yield from' internally more
efficient without actual replacement. I don't know what the current CPython
implementation does.
----------
nosy: +terry.reedy
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<https://bugs.python.org/issue32486>
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