Remove default empty list

[azriel1rf]

Replace [] and {} with None in default values

Mutable variables such as [] and {} in default values may have some side effects and cause unintended results.

In the second section of 8.7 in the Python Language Reference, it is said that use None as the default.

when a default parameter value is a mutable object, such as a list or a dictionary: if the function modifies 
the object (e.g. by appending an item to a list), the default parameter value is in effect modified. This is 
generally not what was intended. A way around this is to use None as the default

https://docs.python.org/3/reference/compound_stmts.html#function-definitions

An easier explanation is in the following page:
https://nikos7am.com/posts/mutable-default-arguments/

With replacing empty collections with None, those typing are modified to Optional.

Replace Mapping with Dict Dict with Mapping

There are some typing incompatibility between Mapping and Dict. mypy reports those errors.
Actually, Mapping is different from Dict. However, assuming the usage in the tests, the suitable type is Dict Mapping.

Typing generics with standard collections (PEP 585)

Since the Python 3.9, the standard collections tuple, list and dict can be used as generics instead of Tuple, List and Dict and PEP 585 aims to remove these typing modules.
Although the supporting versions include 3.7~3.8, those variables are used as the specific standard collections rather than generics so that this modification won't have side effects also for those versions.
https://www.python.org/dev/peps/pep-0585/

• pytest (poetry run pytest)
  • no effects. 70 passed, 9 warnings
• mypy (poetry run mypy .)
  • 127 errors -> 122 errors with mypy 0.910

[azriel1rf]

I'll modify it

[MtkN1]

Thank you for your pull request.

Replace [] and {} with None in default values

LGTM🙇‍♂️

Replace Mapping with Dict

This is aiohttp specification.

https://github.com/aio-libs/aiohttp/blob/750b15f89c26d6a3332ac29d236764ef71e50994/aiohttp/client.py#L312

It works in Mapping format instead of Dict. I don't think there is any need to change it.

import asyncio
import pybotters

async def main():
    async with pybotters.Client() as client:
        async with client.get(
            "https://httpbin.org/get",
            # params={"foo": "bar"},
            params=[("foo", "bar")],
        ) as resp:
            data = await resp.text()
        print(data)

asyncio.run(main())

Typing generics with standard collections (PEP 585)

Python 3.7 ~ 3.8 requires from __future__ import annotations, so pytest is failing.

https://www.python.org/dev/peps/pep-0585/#implementation

I want to use the typing module according to the aiohttp source code, should this use the standard collection?

[azriel1rf]

Thanks for the review.

• Replace Mapping with Dict
  That's inverted. One of the Dicts is replaced with Mapping

  Finally it comes out:

  • Mapping: nothing to change
  • Dict:
    • params in client.py -> Mapping
    • the others -> dict

• Generics
  Thanks. I use it.

---

Plus, I rebased commits and unintentionally be tracked authorship for previous commits(not related with me). Squash my commits at your ease when merging.

[MtkN1]

** Please change the target branch to develop **

[MtkN1]

LGTM🥳
Thanks for the contribution!