I'd be nice with a way to install packages on-demand from with-in scripts.

Like this

--------------------
import pip

def install(package):
    if hasattr(pip, 'main'):
        pip.main(['install', package])
    else:
        pip._internal.main(['install', package])

...

install('pillow')
--------------------

Running this code via scripter fails with:
**********************
locale.Error: unsupported locale setting

In file: /tmp/.mount_krita-ymDKuy/usr/lib/python3.5/locale.py
In function: setlocale at line: 594. Line with error:
return _setlocale(category, locale)
**********************