Passing argument with self assignment into constructor

Asked Nov 27 '19 at 14:57

Active Nov 27 '19 at 14:57

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I am very new to Python. My objective is to convert a Python library to Java, which I have several years of experience with.

For the most part, porting this library has been a breeze with the exception of one single line of code (repeated several times) that I don't understand. I've tried searching for an answer to no avail. So here I am.

                                                             ↓                   ↓
self.push(ComparisonExpression(object_path, value, comparator=comparator, negated=negated))

In Java, this would be self-assignment. I don't imagine this being the same in Python because it achieves nothing. Is this a null check which results in a boolean? I am very confused.

asked Nov 27 '19 at 14:57

user0000001

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They are keyword arguments. Java does not have such things; you'd have to use positional arguments. – khelwood Nov 27 '19 at 14:58
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https://stackoverflow.com/questions/1419046/normal-arguments-vs-keyword-arguments – khelwood Nov 27 '19 at 14:59
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Keyword arguments have the form key=value. So in comparator=comparator, the first comparator is the keyword. The second is a reference to some variable in the scope of the call to self.push(). – Mario Camilleri Nov 27 '19 at 15:03
Thank you, folks. This is very helpful. – user0000001 Nov 27 '19 at 15:13

Passing argument with self assignment into constructor

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