[Python-ideas] Assignments in list/generator expressions
Greg Ewing
greg.ewing at canterbury.ac.nz
Tue Apr 12 02:14:37 CEST 2011
Nick Coghlan wrote:
> This one is tricky, since the assignment is *after* the for loop, but
> *before* the filter condition.
That's why I like the 'letting' form, because it both
reads correctly and matches the order of execution.
ys = [y for x in xs letting y = f(x) if y]
translates to
ys = []
for x in xs:
y = f(x)
if y:
ys.append(y)
--
Greg
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