When I run the coverage example to report on missing lines, I get:

pytest --cov=cards --report=term-missing ch7 ERROR: usage: pytest [options] [file_or_dir] [file_or_dir] [...] pytest: error: unrecognized arguments: --report=term-missing 

It works fine when I run ​​coverage​​ ​​report​​ ​​--show-missing.

Digging a bit in the options shows that this line should be: pytest --cov=cards --cov-report=term-missing ch7 (the prefix cov- is missing in the cov-report option).