You're posting to the non-*NIX forum section, but your profile shows you're posting from Linux. So what is your OS?
Depending on the distro, the package name may be
python3-gi (Debian-based) or
python3-gobject (Fedora-based) or
pygobject (Slackware-based) or something else.
Quote:
Originally Posted by phoenix-anna
git.require_version("Gtk","3.0")
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This obviously should be
gi.require_version("Gtk","3.0").