Message299800
The behavior is consistent:
>>> a = [1, 2]
>>> b = [3, 4]
>>> [(a, b) for a in a for b in b]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 1, in <listcomp>
UnboundLocalError: local variable 'b' referenced before assignment
I'm not sure why it is only the nested loop that raises the error (https://docs.python.org/3/reference/expressions.html#displays-for-lists-sets-and-dictionaries seems to imply it should raise for both)
By the way, the actual result of your comprehesion would be {"a": 2, "b" 2}. |
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Date |
User |
Action |
Args |
2017-08-06 14:07:19 | r.david.murray | set | recipients:
+ r.david.murray, ksqsf |
2017-08-06 14:07:19 | r.david.murray | set | messageid: <1502028439.19.0.677358935414.issue31126@psf.upfronthosting.co.za> |
2017-08-06 14:07:19 | r.david.murray | link | issue31126 messages |
2017-08-06 14:07:19 | r.david.murray | create | |
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