generator runout

[Skaperen]

this can get annoying:

Output:
>>> regions_fns = (f'{pre}{my}{aws}{ec2}region{s}{ext}'  \
...               for my in ('my_','my','')              \
...               for aws in ('aws_','aws','')           \
...               for ec2 in ('ec2_','ec2','')           \
...               for pre in ('','.','.config/')         \
...               for s in ('s','')                      \
...               for ext in ('.list','.txt','.conf','') \
... )
>>> len([x for x in regions_fns])
648
>>> len([x for x in regions_fns])
0
>>>