|Do you know where your variables are?|
Why restrict yourself, look at Perl AND Python, gaining familiarity with more than one tool set is not a bad thing.
Having serious exposure to multiple languages increases the number and variety of gigs you can tackle. It puts you in the position of letting the Problem Domain determine the Language -- time sensitive jobs in C; text handling in in Perl or Python; regular expressions in Perl; web-code in Perl, PHP, or AJAX (or node.js and the web-server of your choice). Increased flexibility reads as increased marketability.