How to upgrade disutils package PyYAML?

Question

I was trying to install chatterbot which has a dependency on PyYAML=3.12. In my Ubuntu machine installed PyYAML version is

Answer 1

Try using the --ignore-installed flag:

sudo -H pip3 install --ignore-installed PyYAML

This works because to upgrade a package, pip first uninstalls the old version, then installs the new version. It is the uninstall step that fails for distutils packages. With the --ignore-installed flag, the uninstall step is skipped and the new version is simply installed on top of the old one.