add py.typed marker, to indicate this package provides type hints

[gjcarneiro]

What do these changes do?

This package seems to to have type hints, but it is not signalling that it provides them. This adds the signal.

See PEP 561.

Are there changes in behavior for the user?

When doing type checking, aiopg is now consulted for typing information.

Related issue number

Checklist

• [x] I think the code is well written
• [x] Unit tests for the changes exist
• [x] Documentation reflects the changes
• [ ] Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> (e.g. 588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the PR
  • ensure type is one of the following:
  • .feature: Signifying a new feature.
  • .bugfix: Signifying a bug fix.
  • .doc: Signifying a documentation improvement.
  • .removal: Signifying a deprecation or removal of public API.
  • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example: Fix issue with non-ascii contents in doctest text files.

[codecov[bot]]

Codecov Report

Merging #878 (cb4dd54) into master (e131396) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #878   +/-   ##
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  Coverage   93.32%   93.32%           
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  Files          12       12           
  Lines        1574     1574           
  Branches      187      187           
=======================================
  Hits         1469     1469           
  Misses         73       73           
  Partials       32       32           

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[andrew-chang-dewitt]

I'd love to have py.typed for aiopg in my projects; is there anything I can do to help get this PR merged?

[gjcarneiro]

I'd love to have py.typed for aiopg in my projects; is there anything I can do to help get this PR merged?

FYI, in my (docker based) code I just patched it like this:

# https://github.com/aio-libs/aiopg/pull/878
RUN touch /app/env/lib/python3.8/site-packages/aiopg/py.typed

You'll have to possibly adjust the path to the correct location for your case, but once the py.typed file is created then mypy should start consulting aiopg for type annotations.

[aklim007]

this library does not provide type hints completely. and now it broke Mypy

error: Call to untyped function "begin" in typed context [no-untyped-call] error: Call to untyped function "execute" in typed context [no-untyped-call]