In Perl, if I want to assign $myVar a value of $var1, $var2, or $var3, based on which one evaluates to true, I would code the following:
$myVar = $var1 || $var2 || $var3;
I am working on separate projects in both Python and PHP, and I have not figured out how to code this situation as concisely in either language.
What is the best way to code this in Python?
What is the best way to code this in PHP?
分享 Perl 'autovivifies' variables upon first reference (as far as I remember). Python will raise a NameError if a variable doesn't exist. However, you can do something like this.
var1 = var2 = var3 = None
# code that might change the value of three variables mentioned above
myvar = var1 or var2 or var3
Generally speaking, checking if a variable is defined (and altering the control flow based on that) is a bad thing in Python. You should use a dictionary and keys.
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