python 3.6 f-string prefix not recognized #1156
Description
(Original issue 1452 created by t-makaro on 2018-06-24T01:46:34.574468+00:00)
'u','b','r','rb','br' (and their capitalized variants) are parsed by the Python 3 lexer as Token.Literal.String.Affix.
'f','rf','fr' (and their capitalized variants) are parsed as Token.Name.
To reproduce:
from pygments.lexer.python import Python3Lexer
lexer = Python3Lexer()
code1 = 'f"str"'
code2 = 'r"str"'
print(list(lexer.get_tokens(code1)))
print(list(lexer.get_tokens(code2)))
code2 tokenizes fine, but code 1 tokenizes wrongly.