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Add compatibility for AST changes in Python 3.7 #233

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Add compatibility for AST changes in Python 3.7 #233

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4 changes: 3 additions & 1 deletion datashape/lexer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,9 @@
def _str_val(s):
# Use the Python parser via the ast module to parse the string,
# since the string_escape and unicode_escape codecs do the wrong thing
return ast.parse('u' + s).body[0].value.s
# mode='single' is necessary since Python 3.7, see:
# https://bugs.python.org/issue32911#msg315581
return ast.parse('u' + s, mode='single').body[0].value.s

# A list of the token names, corresponding regex, and value extraction function
_tokens = [
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