.0 in name

[bryangan41]

May I know (1) why can the name start with a number?(2) where in the doc is 
it?!>>> import pdb>>> pdb.run('(a for a in "")')> <string>(1)<module>()(Pdb) 
s--Call--> <string>(1)<genexpr>()(Pdb) a.0 = <str_iterator object at 
0xb685b100>(Pdb) c>>>Sent from Samsung tablet.
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