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

Are there any popular idioms in python to derive quick ... datatypes with named accessors?

Dataclases. They accomplish this exact need.

Some answers have mentioned dataclasses, but here is an example.

Code

import dataclasses as dc


@dc.dataclass(unsafe_hash=True)
class Pruefer:
    ident : int
    maxnum : float = float("inf")
    name : str  = ""

Demo

pr = Pruefer(1, 2.0, "3")

pr
# Pruefer(ident=1, maxnum=2.0, name='3')

pr.ident
# 1

pr.maxnum
# 2.0

pr.name
# '3'

hash(pr)
# -5655986875063568239

---

Details

You get:

• pretty reprs
• default values
• hashing
• dotted attribute-access
• ... much more

You don't (directly) get:

• tuple unpacking (unlike namedtuple)

Here's a guide on the details of dataclasses.