Fix flake8: os imported, but unused
Fix flake8: os imported, but unused

Likely due to b6fa4e24.

The-Compiler/pytest,tomviner/pytest,pfctdayelise/pytest,The-Compiler/pytest,RonnyPfannschmidt/pytest,alfredodeza/pytest,pytest-dev/pytest,nicoddemus/pytest,Akasurde/pytest,nicoddemus/pytest,txomon/pytest,tomviner/pytest,hackebrot/pytest,markshao/pytest