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Fix TextIO compatibility with Python 3.6+ in LexerFile (#3067) 

* Fix TextIO compatibility with Python 3.6+ in LexerFile

* Sign contributors.txt
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Taras Sotnikov 2021-02-03 02:48:41 +01:00 committed by GitHub
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contributors.txt
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@ -285,3 +285,4 @@ YYYY/MM/DD, github id, Full name, email
2020/12/01, maxence-lefebvre, Maxence Lefebvre, maxence-lefebvre@users.noreply.github.com
2020/12/03, electrum, David Phillips, david@acz.org
2021/01/25, l215884529, Qiheng Liu, 13607681+l215884529@users.noreply.github.com
2021/02/02, tsotnikov, Taras Sotnikov, taras.sotnikov@gmail.com

5
tool/resources/org/antlr/v4/tool/templates/codegen/Python3/Python3.stg
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@ -756,8 +756,11 @@ LexerFile(lexerFile, lexer, namedActions) ::= <<
<fileHeader(lexerFile.grammarFileName, lexerFile.ANTLRVersion)>
from antlr4 import *
from io import StringIO
from typing.io import TextIO
import sys
if sys.version_info[1] > 5:
from typing import TextIO
else:
from typing.io import TextIO
<namedActions.header>