disable some Cython syntax in .py compilation mode: typecasts, &..., sizeof()

Cython/Compiler/Parsing.py

@@ -278,7 +278,8 @@ def _p_factor(s):
         pos = s.position()
         s.next()
         return ExprNodes.unop_node(pos, op, p_factor(s))
-    elif sy == '&':
+    elif not s.in_python_file:
+        if sy == '&':
             pos = s.position()
             s.next()
             arg = p_factor(s)
@@ -287,7 +288,6 @@ def _p_factor(s):
             return p_typecast(s)
         elif sy == 'IDENT' and s.systring == "sizeof":
             return p_sizeof(s)
-    else:
     return p_power(s)
 
 def p_typecast(s):