Fixed regression in handling of imports (fixes #160)

[jameslamb]

In this PR, I attempted to fix the issue @austin3dickey raised in #160 . The fix here returns doppel-cli's handling of standard-lib functions (e.g. from warnings import warn) to the previous behavior.

I added @austin3dickey's reproducible example as a test package and added tests on it. Note that in those tests, I'm not taking a stand on what the behavior should be, just trying to document the current behavior so regressions like this aren't accidentally introduced in the future.

For example, right now I know that doppel-cli isn't doing the "right" thing for a package like feather, where it seems obvious that they are trying to "re-export" from other packages

from pyarrow.feather import (read_feather as read_dataframe,  # noqa
                             write_feather as write_dataframe,
                             FeatherError,
                             FeatherReader,
                             FeatherWriter)

As of this commit, runningdoppel-describe -p pythonspecific2 -l python -d out/ yields:

{
  "name": "pythonspecific2 [python]",
  "language": "python",
  "functions": {
    "create_warm_things": {
      "args": [
        "~~KWARGS~~"
      ]
    },
    "create_warning": {
      "args": []
    }
  },
  "classes": {}
}

I tested with doppel-cli==0.2.1 and got the exact same output.

The tests are passing for the other built-in cases I tried to address in #155 so I don't think this is undoing that work.

[austin3dickey]

This whole file is great, but this is the best line.

[jameslamb]

I think this PR is stalled because Travis is struggling (microsoft/LightGBM#2954 (comment))

[jameslamb]

closing and re-opening to retrigger CI correctly. Travis had an outage today caused by a GCP outage.

[codecov-io]

Codecov Report

Merging #161 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #161   +/-   ##
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  Coverage     100%   100%           
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  Files           6      6           
  Lines         316    316           
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  Hits          316    316

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[jameslamb]

I think the travis outage has left this PR in a weird state. Also they had this incident yesterday:

I can clearly see that the build passed: https://travis-ci.org/github/jameslamb/doppel-cli/builds/667965392, so I'm going to use executive power and merge.