The originally posted code:

perl = "C:\\Perl64\\bin\\perl.exe"
perl_script "C:\\vub_work\\py_learn\\hello.pl"
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In the
    perl = "C:\\Perl64\\bin\\perl.exe"
statement, why is the quoted string assigned to the perl variable, and in
    perl_script "C:\\vub_work\\py_learn\\hello.pl"
why is the quoted string not assigned to the perl_script variable?