THE EXECUTION MODEL
Although not a vital part of your understanding of the differences between Perl and Python, understanding the similarities and differences between the two models of execution is a useful side note.
Perl
Perl's execution model, follows a very simple path. The model assumes you've just run a Perl script from a text file, which with some minor differences applies equally to the methods used for executing embedded scripts (from C/C++), in-line evaluations (through eval), and the one line scripts supplied on the command line.
Following the figure the basic execution process for Perl goes like this:
1. | Read the source code. |
2. | Immediately execute any BEGIN blocks in the source. |
3. | Import (and if necessary evaluate and execute) the ... |
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