how to do a numeric sort

[Skaperen]

i think all that is needed is a sort key function for this. i want to have a list of files sorted in a numeric way so that:

Output:
python-3.4.0-foo.gz
python-3.4.1-foo.gz
python-3.4.10-foo.gz
python-3.4.2-foo.gz
python-3.4.3-foo.gz
python-3.4.4-foo.gz
python-3.4.5-foo.gz
python-3.4.6-foo.gz
python-3.4.7-foo.gz
python-3.4.8-foo.gz
python-3.4.9-foo.gz
python-3.5.0-foo.gz
python-3.5.1-foo.gz
python-3.5.2-foo.gz
python-3.5.3-foo.gz
python-3.5.4-foo.gz
python-3.5.5-foo.gz
python-3.5.6-foo.gz
python-3.5.7-foo.gz

gets sorted like:

Output:
python-3.4.0-foo.gz
python-3.4.1-foo.gz
python-3.4.2-foo.gz
python-3.4.3-foo.gz
python-3.4.4-foo.gz
python-3.4.5-foo.gz
python-3.4.6-foo.gz
python-3.4.7-foo.gz
python-3.4.8-foo.gz
python-3.4.9-foo.gz
python-3.4.10-foo.gz
python-3.5.0-foo.gz
python-3.5.1-foo.gz
python-3.5.2-foo.gz
python-3.5.3-foo.gz
python-3.5.4-foo.gz
python-3.5.5-foo.gz
python-3.5.6-foo.gz
python-3.5.7-foo.gz

anyone know of code that can do this?