remove ast.__version__ (closes #12273)

Parser/asdl_c.py

@@ -900,10 +900,6 @@ class ASTModuleVisitor(PickleVisitor):
         self.emit('if (PyDict_SetItemString(d, "AST", (PyObject*)&AST_type) < 0) return NULL;', 1)
         self.emit('if (PyModule_AddIntConstant(m, "PyCF_ONLY_AST", PyCF_ONLY_AST) < 0)', 1)
         self.emit("return NULL;", 2)
-        # Value of version: "$Revision$"
-        self.emit('if (PyModule_AddStringConstant(m, "__version__", "%s") < 0)'
-                % (mod.version,), 1)
-        self.emit("return NULL;", 2)
         for dfn in mod.dfns:
             self.visit(dfn)
         self.emit("return m;", 1)
@@ -1124,29 +1120,6 @@ class ChainOfVisitors:
 
 common_msg = "/* File automatically generated by %s. */\n\n"
 
-c_file_msg = """
-/*
-   __version__ %s.
-
-   This module must be committed separately after each AST grammar change;
-   The __version__ number is set to the revision number of the commit
-   containing the grammar change.
-*/
-
-"""
-
-
-def get_file_revision(f):
-    """Fish out the last change to a file in hg."""
-    args = ["hg", "log", "--template", "{node|short}", "--limit", "1", f]
-    p = subprocess.Popen(args, stdout=subprocess.PIPE)
-    out = p.communicate()[0]
-    if p.returncode:
-        print >> sys.stderr, "error return code from hg"
-        sys.exit(1)
-    return out
-
-
 def main(srcfile):
     argv0 = sys.argv[0]
     components = argv0.split(os.sep)
@@ -1155,7 +1128,6 @@ def main(srcfile):
     mod = asdl.parse(srcfile)
     if not asdl.check(mod):
         sys.exit(1)
-    mod.version = get_file_revision(srcfile)
     if INC_DIR:
         p = "%s/%s-ast.h" % (INC_DIR, mod.name)
         f = open(p, "w")
@@ -1175,7 +1147,6 @@ def main(srcfile):
         p = os.path.join(SRC_DIR, str(mod.name) + "-ast.c")
         f = open(p, "w")
         f.write(auto_gen_msg)
-        f.write(c_file_msg % (mod.version,))
         f.write('#include "Python.h"\n')
         f.write('#include "%s-ast.h"\n' % mod.name)
         f.write('\n')