[FIXED] Define a list with type

Issue

I come from Java, and I want to do some data transfer objects (DTOs) like this:

class ErrorDefinition():
    code = ''
    message = ''
    exception = ''

class ResponseDTO():
    sucess = True
    errors = list() # How do I say it that it is directly of the ErrorDefinition() type, to not import it every time that I'm going to append an error definition?

Or is there a better way to do this?

Solution

errors = list() # How do I say it that it is directly of the ErrorDefinition() type, to not import it every time that I'm going to append an error definition?

I am not sure what you are trying to say in this comment, but if I understand right, the best way to get something close is to define a method to add an error.

class ResponseDTO(object): # New style classes are just better, use them.

    def __init__(self):
        self.success = True # That's the idiomatic way to define an instance member.
        self.errors = [] # Empty list literal, equivalent to list() and more idiomatic.

    def append_error(self, code, message, exception):
        self.success = False
        self.errors.append(ErrorDefinition(code, message, exception))

Answered By - ddaa