pip install google-auth did not install requests dependency

[sterlinb]

Once recognized, this was trivially mitigated by running pip install requests, so no support is needed.

Environment details

• OS: Linux experimental-1 5.10.0-14-cloud-amd64 Internal transport discussion #1 SMP Debian 5.10.113-1 (2022-04-29) x86_64 (Cloud Compute Engine instance)
• Python version: Python 3.9.2
• pip version: pip 20.3.4
• google-auth version: 2.8.0

Steps to reproduce

1. Setup new clean python environment:

sudo apt update
sudo apt install python3 python3-dev python3-venv
sudo apt-get install wget
wget https://bootstrap.pypa.io/get-pip.py
sudo python3 get-pip.py
python3 -m venv env
source env/bin/activate
pip install --upgrade google-auth

2. Run python and try to import;

python3
>>> import google.oauth2.id_token

3. Exception results:

Traceback (most recent call last):
  File "/home/bramsterling/tokenexpt/env/lib/python3.9/site-packages/google/auth/transport/requests.py", line 26, in <module>
    import requests
ModuleNotFoundError: No module named 'requests'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/bramsterling/tokenexpt/env/lib/python3.9/site-packages/google/oauth2/id_token.py", line 67, in <module>
    import google.auth.transport.requests
  File "/home/bramsterling/tokenexpt/env/lib/python3.9/site-packages/google/auth/transport/requests.py", line 30, in <module>
    six.raise_from(
  File "<string>", line 3, in raise_from
ImportError: The requests library is not installed, please install the requests package to use the requests transport.

[sai-sunder-s]

Thank you for raising the issue. We will check if requests was not added by default for some reason and add to dependencies list if it was just missed.

[clundin25]

It seems reasonable to me to add requests to the default setup.py dependencies. Alternatively we could add it as an extra similar to aiohttp.