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Perl is much more terse for one-liners and has much more built-in for doing text processing in scripts. Stuff like implicit read loop, field separation, etc. I would say they're suitable for different jobs: if a perl script grows beyond a hundred lines (you can do a surprising amount in that space!), then Python may be the right tool.

Perl is also much more of a known target: some version of it exists on basically every single Unix, and the language really hasn't changed that much in the past decade. I have SSH'ed into multiple CentOS 6/SLES 11 (released 2009, and granted mostly to rescue data off them) servers in the past 2 years, and perl is just much more of a known target to write things against than whatever python release is on that system.