/usr/share/doc/python-apt/examples/update.py is in python-apt-doc 0.8.3ubuntu7.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | #!/usr/bin/python
import apt
import apt_pkg
import os.path
if __name__ == "__main__":
apt_pkg.Config.Set("APT::Update::Pre-Invoke::",
"touch /tmp/update-about-to-run")
apt_pkg.Config.Set("APT::Update::Post-Invoke::",
"touch /tmp/update-was-run")
c = apt.Cache()
res = c.update(apt.progress.TextFetchProgress())
print "res: ", res
assert(os.path.exists("/tmp/update-about-to-run"))
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