Невозможно указывать метод экземпляра объекта или классовый метод в качестве источника значения переменной #54

class A:
    @classmethod
    def test(cls):
        return "test"


Variable("test", type=StringType, source=Calculate(A.test))

  File "/var/calculate/.project/trunk4/calculate-lib/calculate/variables/datavars.py", line 445, in check
    self._check_function(self.depend_function)                                                                        
  File "/var/calculate/.project/trunk4/calculate-lib/calculate/variables/datavars.py", line 500, in _check_function
    for node in ast.walk(ast.parse(getsource(function_to_check))):                                             
  File "/usr/lib64/python3.6/ast.py", line 35, in parse
    return compile(source, filename, mode, PyCF_ONLY_AST)                                                             
  File "<unknown>", line 1
    @classmethod                                                                                                      
    ^           
IndentationError: unexpected indent