How to exclude external packages from coverage report when using coverage.py API ?

[AkashKumar7902]

when I use coverage.py API, it includes the coverage report for the external packages too.

For example:

    /usr/lib/python3/dist-packages/yaml/reader.py:
    - 135
    - 139
    - 140
    - 147
    - 148

I don't want to include external packages in my coverage report.