Python: Quick and dirty datatypes (DTO)

Question

Very often, I find myself coding trivial datatypes like

class Pruefer:
    def __init__(self, ident, maxNum=float(\'inf\')         


        

Answer 1

One of the most promising things from with Python 3.6 is variable annotations. They allow to define namedtuple as class in next way:

In [1]: from typing import NamedTuple

In [2]: class Pruefer(NamedTuple):
   ...:     ident: int
   ...:     max_num: int
   ...:     name: str
   ...:     

In [3]: Pruefer(1,4,"name")
Out[3]: Pruefer(ident=1, max_num=4, name='name')

It same as a namedtuple, but is saves annotations and allow to check type with some static type analyzer like mypy.

Update: 15.05.2018

Now, in Python 3.7 dataclasses are present so this would preferable way of defining DTO, also for backwardcompatibility you could use attrs library.