Jan. 21, 2017
2:50 p.m.
Serhiy Storchaka added the comment: There are just 8 legal combinations if ignore case:
import tokenize sorted({x.lower() for x in tokenize._all_string_prefixes() if x}) ['b', 'br', 'f', 'fr', 'r', 'rb', 'rf', 'u']
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