I don't have materials of my own, but some points: especially with a Python background, some of the differences stand out:
- context is a concept unique to Perl, and explained very good in the corresponding chapter of chromatic's book
- Python has an explicit Boolean data type, Perl has a boolean context
- Python regular expressions are strings, hence different quoting, and "PCRE" are not 100% "PC".
last but not least: as Python only has lexical scope, it was difficult for me to understand dynamic scopes, and although there is overlap between Perl's local and computer science's local, they are not the same.
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