Samples are old and miss requirements.txt

[phaabe]

Here is an example I tried to use:

• https://github.com/googleapis/google-api-python-client/blob/main/samples/calendar_api/calendar_sample.py

Problems

• The imported library is here and it says that the support is turned down long time ago.
  • https://pypi.org/project/oauth2client
• Missing requirements.txt (would have helped)