What's the best way to learn perl for a python programmer?

[vj]

I've been given a project which requires writing scripts that need to
be run on over 3000 servers. Only about 15% of them have python
installed on them. While all/most of them will have perl.

I'll try and do as much as possible in pexpect but am sure I'll have do
some significant perl. Any suggestions on what is the best way to get
upto speed on perl?