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In the following code, the original traceback attached to the exception thrown into the generator is ignored:
def gen():
 try:
 yield
 except:
 raise
g = gen()
try:
 1/0
except ZeroDivisionError as v:
 g.throw(v)
But if you replace the last line with:
 g.throw(type(v), v, v.__traceback__)
then the original traceback gets appended.
g.throw() should have fetched the __traceback__ attribute by itself.