Replace usage of parser.suite with ast.parse

Replaced usage of the long-superseded "parser.suite" module in the
mako.util package for parsing the python magic encoding comment with the
"ast.parse" function introduced many years ago in Python 2.5, as
"parser.suite" is emitting deprecation warnings in Python 3.9.

Fixes https://github.com/sqlalchemy/mako/issues/310
See also https://github.com/sqlalchemy/mako/commit/2dae7d2c3da73653e6de329dc15c55056a0b9ab6

diff --git a/babel/util.py b/babel/util.py
index 73a90516fb4bf03ce7c68620c3b7de42126592d8..c371badbde89c15e241bbae252a08b5d414e0fc9 100644 (file)
--- a/babel/util.py
+++ b/babel/util.py
@@ -68,8 +68,8 @@ def parse_encoding(fp):
         m = PYTHON_MAGIC_COMMENT_re.match(line1)
         if not m:
             try:
-                import parser
-                parser.suite(line1.decode('latin-1'))
+                import ast
+                ast.parse(line1.decode('latin-1'))
             except (ImportError, SyntaxError, UnicodeEncodeError):
                 # Either it's a real syntax error, in which case the source is
                 # not valid python source, or line2 is a continuation of line1,