decorators not processed successfully with alpha_vantage

[AnthonyZ71]

Bug description

Using pip install --upgrade alpha_vantage and the following application (av_pylint_test.py):

#!/usr/bin/env python
"""Example application to demonstrate pylint false positives"""
import os

from alpha_vantage.timeseries import TimeSeries

api_key = os.getenv("AV_API_KEY")
time_series = TimeSeries(key=api_key)
av_data, _ = time_series.get_daily_adjusted("IBM", "compact")
av_quote_dates = av_data.keys()
for quote_date in av_quote_dates:
    print(f"{quote_date} : {av_data[quote_date]['4. close']}")

Unfortunately, to get an ALPHA VANTAGE API key they do require to register with their website. Using the demo key doesn't work.

This may be a duplicate of #7437 but I'm not sure if that is the case or not.

Following the code a little bit:

    @av._output_format
    @av._call_api_on_func
    def get_daily_adjusted(self, symbol, outputsize='compact'):
        _FUNCTION_KEY = "TIME_SERIES_DAILY_ADJUSTED"
        return _FUNCTION_KEY, 'Time Series (Daily)', 'Meta Data'

The _call_api_on_func looks like it creates and returns a wrapper function that invokes the API which is then passed into _output_format which creates another wrapper around the function to convert the output of the API into the requested format.

Command used

pylint av_pylint_test.py

Pylint output

************* Module av_pylint_test
av_pylint_test.py:9:0: W0632: Possible unbalanced tuple unpacking with sequence defined at line 76 of alpha_vantage.timeseries: left side has 2 labels, right side has 3 values (unbalanced-tuple-unpacking)
av_pylint_test.py:10:17: E1101: Instance of 'str' has no 'keys' member (no-member)

------------------------------------------------------------------
Your code has been rated at 2.50/10 (previous run: 2.50/10, +0.00)

Expected behavior

pylint would follow the decorators and understand the actual output.

Pylint version

pylint 2.16.2
astroid 2.14.2
Python 3.11.2 (main, Feb 11 2023, 02:24:27) [GCC 10.2.1 20210110]

OS / Environment

vscode devcontainer based upon mcr.microsoft.com/devcontainers/python:3

Additional dependencies

alpha-vantage==2.3.1
pandas==1.5.3

There are a lot of other libraries loaded into this environment. In case there are additional dependencies that I didn't realize, this is the full output of the pip freeze:

absl-py==1.4.0
aiohttp==3.8.4
aiosignal==1.3.1
alpha-vantage==2.3.1
anyio==3.6.2
appdirs==1.4.4
astroid==2.14.2
astunparse==1.6.3
async-generator==1.10
async-timeout==4.0.2
attrs==22.2.0
Authlib==1.2.0
autopep8==2.0.1
beautifulsoup4==4.11.2
cachetools==5.3.0
certifi==2022.12.7
cffi==1.15.1
charset-normalizer==3.0.1
contourpy==1.0.7
cryptography==39.0.1
cycler==0.11.0
dill==0.3.6
flatbuffers==23.1.21
fonttools==4.38.0
frozendict==2.3.4
frozenlist==1.3.3
gast==0.4.0
google-auth==2.16.0
google-auth-oauthlib==0.4.6
google-pasta==0.2.0
greenlet==2.0.1
grpcio==1.51.1
h11==0.14.0
h5py==3.8.0
html5lib==1.1
httpcore==0.16.3
httpx==0.23.3
idna==3.4
isort==5.12.0
jax==0.4.3
keras-nightly==2.13.0.dev2023021508
kiwisolver==1.4.4
lazy-object-proxy==1.9.0
libclang==15.0.6.1
lxml==4.9.2
mariadb==1.1.5.post3
Markdown==3.4.1
MarkupSafe==2.1.2
matplotlib==3.7.0
mccabe==0.7.0
multidict==6.0.4
multitasking==0.0.11
numpy==1.23.5
nvidia-cublas-cu11==11.10.3.66
nvidia-cuda-nvrtc-cu11==11.7.99
nvidia-cuda-runtime-cu11==11.7.99
nvidia-cudnn-cu11==8.5.0.96
oath==1.4.4
oauthlib==3.2.2
opt-einsum==3.3.0
outcome==1.2.0
packaging==23.0
pandas==1.5.3
Pillow==9.4.0
platformdirs==3.0.0
playwright==1.30.0
playwright-stealth==1.0.5
prompt-toolkit==3.0.36
protobuf==4.21.12
pyasn1==0.4.8
pyasn1-modules==0.2.8
pycodestyle==2.10.0
pycparser==2.21
pycryptodome==3.17
pyee==9.0.4
pylint==2.16.2
pyotp==2.8.0
pyparsing==3.0.9
PySocks==1.7.1
python-dateutil==2.8.2
python-vipaccess==0.14.1
pytz==2022.7.1
requests==2.28.2
requests-oauthlib==1.3.1
rfc3986==1.5.0
rsa==4.9
schwab-api==0.2.2
scipy==1.10.0
selenium==4.8.0
six==1.16.0
sniffio==1.3.0
sortedcontainers==2.4.0
soupsieve==2.4
SQLAlchemy==2.0.3
ta==0.10.2
tb-nightly==2.13.0a20230215
tda-api==1.6.0
tensorboard-data-server==0.7.0
tensorboard-plugin-wit==1.8.1
tensorflow-io-gcs-filesystem==0.30.0
termcolor==2.2.0
tf-estimator-nightly==2.13.0.dev2023021509
tf-nightly==2.13.0.dev20230215
tomlkit==0.11.6
torch==1.13.1
trio==0.22.0
trio-websocket==0.9.2
typing_extensions==4.5.0
urllib3==1.26.14
wcwidth==0.2.6
webencodings==0.5.1
websockets==10.4
Werkzeug==2.2.3
wrapt==1.14.1
wsproto==1.2.0
yarl==1.8.2
yfinance==0.2.11

[AnthonyZ71]

Running the sample application this morning results in:

$ ./av_pylint_test.py 
2023-02-15 : 136.4
2023-02-14 : 136.01
...
2022-09-26 : 122.01
2022-09-23 : 122.71