Comment 2 for bug 1735559

Looks like a lot of time is spent in here initially.

[node_visitor] DEBUG Str(s='474771')
[meta_ast] DEBUG adding node : 0x10c9d9250 [2]
[node_visitor] DEBUG entering: 0x10c9d9250 <class '_ast.Str'> [2]
[node_visitor] DEBUG {'node': <_ast.Str object at 0x10c9d9250>, 'imports': set(['util.u']), 'filename': 'phonenumbers-8.5.2/phonenumbers/carrierdata/data0.py', 'linerange': [4969], 'lineno': 4969, 'import_aliases': {'u': 'util.u'}}
[node_visitor] DEBUG visit_Str called (Str(s='474771'))

There is a fairly large hard-coded dictionary that is probably not the most performant.