Install libpython3.7-testsuite by entering the following commands in the terminal:
sudo apt update sudo apt install libpython3.7-testsuite
Description:
Testsuite for the Python standard library (v3.7)
The complete testsuite for the Python standard library. Note that a subset is found in the libpython3.7-stdlib package, which should be enough for other packages to use (please do not build-depend on this package, but file a bug report to include additional testsuite files in the libpython3.7-stdlib package).
Version: 3.7.0~b3-1
Section: universe/libdevel