datetime parsing does not handle generic ISO-8601 strings about mashumaro

[movermeyer]

As of Python 3.11, datetime.fromisoformat can handle all the important bits of the ISO 8601 spec.

I'll be backporting its code in movermeyer/backports.datetime_fromisoformat#21, so it'll be available for earlier versions of Python 3.

FWIW, ciso8601 is still faster than any other parser.

[Fatal1ty]

Yes, there is such a problem. Native fromisoformat doesn't cover all the cases but it's the fastest way to parse most ISO 8601 datetime strings: closeio/ciso8601#66 (comment). But you're right it's the mashumaro's scope to handle generic ISO-8601 strings, so I decided to add a way to choose the parser using field's metadata:

class DataClass(DataClassDictMixin):
    x: datetime = field(metadata={"deserialize": "ciso8601"})

See more examples here: https://github.com/Fatal1ty/mashumaro/tree/datetime-parsers#using-field-metadata
Moreover, I think it's an obvious way to make mashumaro more extensible and I'm going to use it for other things like #11. Also it would be convenient to configure a default behaviour for all fields in one place like Meta class in Django models.

[Fatal1ty]

We can change deserialization method with version 1.18: https://github.com/Fatal1ty/mashumaro#using-field-metadata

[Fatal1ty]

To fully cover the original problem, here is an example with dateutil:

from datetime import datetime
from dataclasses import dataclass, field
from mashumaro import DataClassDictMixin
import dateutil.parser

@dataclass
class A(DataClassDictMixin):
    x: datetime = field(metadata={"deserialize": dateutil.parser.isoparse})

print(A.from_dict({"x": "2019-01-02T07:00:00Z"}))

[Bao-gxg]

Perfect. I'll test it out soon, thank you!