On 2016-09-09 21:01, Arek Bulski wrote:
Sometimes I find myself in need of this nice operator that I used back
in the days when I was programming in .NET, essentially an expression
expr ?? instead
should return expr when it `is not None` and `instead` otherwise.
A piece of code that I just wrote, you can see a use case:
def _sizeof(self, context):
if self.totalsizeof is not None:
return self.totalsizeof
else:
raise SizeofError("cannot calculate size")
With the oprator it would just be
def _sizeof(self, context):
return self.totalsizeof ?? raise SizeofError("cannot calculate
size")
'raise' is a statement, so it can't appear in an expression.
This has been discussed before, so you might want to read this thread first:
Null coalescing operators
https://mail.python.org/pipermail/python-ideas/2015-September/036289.html
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