Let's see a code sentence def consturct_modules(self,):.
I have a simple question about why this method defines (self) as (self,).
It seems to me that (self) is proper form.
What is the difference?
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1It's probably unintentional, but totally valid to leave a trailing comma in the argument list – Mad Physicist Mar 04 '20 at 05:57
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thank you. I understand . There was not problem which raise error maybe – ih s Mar 04 '20 at 06:01
3 Answers
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No difference in terms of function. Trailing comma in function argument lists is allowed starting from Python 3.6. See: https://bugs.python.org/issue9232
In terms of style, the trailing comma is not recommended in this particular case. See: Should I add a trailing comma after the last argument in a function call?
Flux
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The trailing comma makes no difference in parameter lists (though it is a syntax error in Python 3.5 and earlier).
For multi-line parameter lists, I prefer to have trailing commas on each line to make diffs smaller and more uniform.
AKX
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A ha! , I'm using python 3.7 so there was not syntax error. good ! thank you – ih s Mar 04 '20 at 06:03
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There is no difference between (self) and (self,).
The main advantages are that it makes multi-line lists easier to edit and that it reduces clutter in diffs.
Check this link :- Why are trailing commas allowed in a list?
Akhil Pathania
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