Module(body=[
    Print(
          dest=None,
          values=[BinOp( left=Num(n=1),op=Add(),right=Num(n=2))],
          nl=True,
 )])                                

func_def = \
"""
def add(x, y):
    return x + y
print add(3, 5)
"""

>>> cm = compile(func_def, '<string>', 'exec')
>>> exec cm
>>> 8

r_node = ast.parse(func_def)
print astunparse.dump(r_node)    # print ast.dump(r_node)

Module(body=[
    FunctionDef(
        name='add',
        args=arguments(
            args=[Name(id='x',ctx=Param()),Name(id='y',ctx=Param())],
            vararg=None,
            kwarg=None,
            defaults=[]),
        body=[Return(value=BinOp(
            left=Name(id='x',ctx=Load()),
            op=Add(),
            right=Name(id='y',ctx=Load())))],
        decorator_list=[]),
    Print(
        dest=None,
        values=[Call(
                func=Name(id='add',ctx=Load()),
                args=[Num(n=3),Num(n=5)],
                keywords=[],
                starargs=None,
                kwargs=None)],
        nl=True)
  ])

module Python version "$Revision$"
{
  mod = Module(stmt* body)| Expression(expr body)
  stmt = FunctionDef(identifier name, arguments args, stmt* body, expr* decorator_list)
        | ClassDef(identifier name, expr* bases, stmt* body, expr* decorator_list)
        | Return(expr? value)
        | Print(expr? dest, expr* values, bool nl)| For(expr target, expr iter, stmt* body, stmt* orelse)
  expr = BoolOp(boolop op, expr* values)
       | BinOp(expr left, operator op, expr right)| Lambda(arguments args, expr body)| Dict(expr* keys, expr* values)| Num(object n) -- a number as a PyObject.
       | Str(string s) -- need to specify raw, unicode, etc?| Name(identifier id, expr_context ctx)
       | List(expr* elts, expr_context ctx) 
        -- col_offset is the byte offset in the utf8 string the parser uses
        attributes (int lineno, int col_offset)
  expr_context = Load | Store | Del | AugLoad | AugStore | Param
  boolop = And | Or 
  operator = Add | Sub | Mult | Div | Mod | Pow | LShift | RShift | BitOr | BitXor | BitAnd | FloorDiv
  arguments = (expr* args, identifier? vararg, identifier? kwarg, expr* defaults)
}

  class CodeVisitor(ast.NodeVisitor):
      def visit_BinOp(self, node):
          if isinstance(node.op, ast.Add):
              node.op = ast.Sub()
          self.generic_visit(node)
      def visit_FunctionDef(self, node):
          print 'Function Name:%s'% node.name
          self.generic_visit(node)
          func_log_stmt = ast.Print(
              dest = None,
              values = [ast.Str(s = 'calling func: %s' % node.name, lineno = 0, col_offset = 0)],
              nl = True,
              lineno = 0,
              col_offset = 0,
          )
          node.body.insert(0, func_log_stmt)
  r_node = ast.parse(func_def)
  visitor = CodeVisitor()
  visitor.visit(r_node)
  # print astunparse.dump(r_node)
  print astunparse.unparse(r_node)
  exec compile(r_node, '<string>', 'exec')

Function Name:add
def add(x, y):
    print 'calling func: add'
    return (x - y)
print add(3, 5)
calling func: add
-2

  class CodeTransformer(ast.NodeTransformer):
      def visit_BinOp(self, node):
          if isinstance(node.op, ast.Add):
              node.op = ast.Sub()
          self.generic_visit(node)
          return node
      def visit_FunctionDef(self, node):
          self.generic_visit(node)
          if node.name == 'add':
              node.name = 'sub'
          args_num = len(node.args.args)
          args = tuple([arg.id for arg in node.args.args])
          func_log_stmt = ''.join(["print 'calling func: %s', " % node.name, "'args:'", ", %s" * args_num % args])
          node.body.insert(0, ast.parse(func_log_stmt))
          return node
      def visit_Name(self, node):
          replace = {'add': 'sub', 'x': 'a', 'y': 'b'}
          re_id = replace.get(node.id, None)
          node.id = re_id or node.id
          self.generic_visit(node)
          return node
  r_node = ast.parse(func_def)
  transformer = CodeTransformer()
  r_node = transformer.visit(r_node)
  # print astunparse.dump(r_node)
  source = astunparse.unparse(r_node)
  print source
  # exec compile(r_node, '<string>', 'exec')        # 新加入的node func_log_stmt 缺少lineno和col_offset屬性
  exec compile(source, '<string>', 'exec')
  exec compile(ast.parse(source), '<string>', 'exec')

def sub(a, b):
    print 'calling func: sub', 'args:', a, b
    return (a - b)
print sub(3, 5)
calling func: sub args: 3 5
-2
calling func: sub args: 3 5
-2

  class CNCheckHelper(object):
      # 待檢測(cè)文本可能的編碼方式列表
      VALID_ENCODING = ('utf-8', 'gbk')
      def _get_unicode_imp(self, value, idx = 0):
          if idx < len(self.VALID_ENCODING):
              try:
                  return value.decode(self.VALID_ENCODING[idx])
              except:
                  return self._get_unicode_imp(value, idx + 1)
      def _get_unicode(self, from_str):
          if isinstance(from_str, unicode):
              return None
          return self._get_unicode_imp(from_str)
      def is_any_chinese(self, check_str, is_strict = True):
          unicode_str = self._get_unicode(check_str)
          if unicode_str:
              c_func = any if is_strict else all
              return c_func(u'\u4e00' <= char <= u'\u9fff' for char in unicode_str)
          return False

  class CodeCheck(ast.NodeVisitor):
      def __init__(self):
          self.cn_checker = CNCheckHelper()
      def visit_Str(self, node):
          self.generic_visit(node)
          # if node.s and any(u'\u4e00' <= char <= u'\u9fff' for char in node.s.decode('utf-8')):
          if self.cn_checker.is_any_chinese(node.s, True):
              print 'line no: %d, column offset: %d, CN_Str: %s' % (node.lineno, node.col_offset, node.s)
  project_dir = './your_project/script'
  for root, dirs, files in os.walk(project_dir):
      print root, dirs, files
      py_files = filter(lambda file: file.endswith('.py'), files)
      checker = CodeCheck()
      for file in py_files:
          file_path = os.path.join(root, file)
          print 'Checking: %s' % file_path
          with open(file_path, 'r') as f:
              root_node = ast.parse(f.read())
              checker.visit(root_node)

  class LambdaCheck(ast.NodeVisitor):
      def __init__(self):
          self.illegal_args_list = []
          self._cur_file = None
          self._cur_lambda_args = []
      def set_cur_file(self, cur_file):
          assert os.path.isfile(cur_file)， cur_file
          self._cur_file = os.path.realpath(cur_file)
      def visit_Lambda(self, node):
          """
          lambda 閉包檢查原則：
          只需檢測(cè)lambda expr body中args是否引用了lambda args list之外的參數(shù)
          """
          self._cur_lambda_args =[a.id for a in node.args.args]
          print astunparse.unparse(node)
          # print astunparse.dump(node)
          self.get_lambda_body_args(node.body)
          self.generic_visit(node)
      def record_args(self, name_node):
          if isinstance(name_node, ast.Name) and name_node.id not in self._cur_lambda_args:
              self.illegal_args_list.append((self._cur_file, 'line no:%s' % name_node.lineno, 'var:%s' % name_node.id))
      def _is_args(self, node):
          if isinstance(node, ast.Name):
              self.record_args(node)
              return True
          if isinstance(node, ast.Call):
              map(self.record_args, node.args)
              return True
          return False
      def get_lambda_body_args(self, node):
          if self._is_args(node): return
          # for cnode in ast.walk(node):
          for cnode in ast.iter_child_nodes(node):
              if not self._is_args(cnode):
                  self.get_lambda_body_args(cnode)

  project_dir = './your project/script'
  for root, dirs, files in os.walk(project_dir):
      py_files = filter(lambda file: file.endswith('.py'), files)
      checker = LambdaCheck()
      for file in py_files:
          file_path = os.path.join(root, file)
          checker.set_cur_file(file_path)
          with open(file_path, 'r') as f:
              root_node = ast.parse(f.read())
              checker.visit(root_node)
      res = '\n'.join([' ## '.join(info) for info in checker.illegal_args_list])
      print res