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

* Fix TextIO compatibility with Python 3.6+ in LexerFile * Sign contributors.txt
antlr · Feb 3, 2021 · f7b4100 · f7b4100
1 parent 4b64910
commit f7b4100
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diff --git a/contributors.txt b/contributors.txt
@@ -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
diff --git a/tool/resources/org/antlr/v4/tool/templates/codegen/Python3/Python3.stg b/tool/resources/org/antlr/v4/tool/templates/codegen/Python3/Python3.stg
@@ -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>