check-code: catch dict.has_key

contrib/check-code.py

@@ -75,6 +75,7 b' pypats = ['
     (r'lambda\s*\(.*,.*\)',
      "tuple parameter unpacking not available in Python 3+"),
     (r'\breduce\s*\(.*', "reduce is not available in Python 3+"),
+    (r'\.has_key\b', "dict.has_key is not available in Python 3+"),
     (r'^\s*\t', "don't use tabs"),
     (r'\S;\s*\n', "semicolon"),
     (r'\w,\w', "missing whitespace after ,"),