Having defined
sage: x = SR.var('x', 20)
sage: a = [x[11], x[8], x[10], x[9]]
sorting by repr or by str is disappointing:
sage: sorted(a, key=repr)
[x10, x11, x8, x9]
sage: sorted(a, key=str)
[x10, x11, x8, x9]
As Dima suggests, one can
./sage --pip install natsort
and then
sage: from natsort import natsorted
sage: natsorted(a)
[x8, x9, x10, x11]
Without any pip install, one can alternatively use `LooseVersion`:
sage: from distutils.version import LooseVersion
sage: sorted(a, key=lambda z: LooseVersion(str(z)))
[x8, x9, x10, x11]
Note: "./sage --pip install" requires Python's OpenSSL module to be built.
If it was not built, install OpenSSL,
- either system-wide with a package manager, for example
under Debian or Ubuntu do
sudo apt-get install openssl libssl-dev
- or just for your Sage installation by running in a terminal
from the Sage root directory:
sage -i openssl
sage -i pyopenssl
Once OpenSSL is installed by one of the above methods,
Sage's Python needs to be rebuilt by running the following
in a terminal from the Sage root directory
sage -f python2 && sage -f python3 && make
Note also, if x and a were defined as above:
sage: x = SR.var('x', 20)
sage: a = [x[11], x[8], x[10], x[9]]
then without any pip install or any import, one could also do:
sage: sorted(a, key=lambda z: x.index(z))
[x8, x9, x10, x11]
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