perl - Cleanest way of choosing between two values in Python -

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There is a very good method in python datas get : 

 < code> # M to a dict Mkget (a, V) # If M [a] exists, then returns returns, otherwise returns v

is it any value Any way For example, in Perl I can do this: 

  Return $ some_var or "some_var does not exist."

returning one of the or operators in Python Its operation, if the left expression evaluates incorrect , then the correct is evaluated and returned.

Edit :

After reading your question again, I saw that I first misunderstood it. Using the local () built-in function, you can use the variable for the get () method, as if you use it to decrypt ( Although it is neither very beautiful nor dragon), to check whether a value exists or not: 

  & gt; & Gt; & Gt; Get local () ('some_var', 'some_var does not exist.') "Some_var does not exist." & Gt; & Gt; & Gt; Some_var = 0> gt; & Gt; & Gt; ('Some_var', 'some_var does not exist.') 0

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