"Arnaud Delobelle" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
| "Terry Reedy" <[EMAIL PROTECTED]> writes:
|
| > "Arnaud Delobelle" <[EMAIL PROTECTED]> wrote in message
| >
news:[EMAIL PROTECTED]
| >
| > here is a very sophisticated implementation :)
| >
| >>>> def extract(indices, seq):
| > ... return tuple(seq[i] for i in indices)
| > ...
| >>>> y, d = extract((0, 2), time.localtime())
| >>>> y, d
| > (2008, 12)
| >
| > ===================
| > Or a generator version:
| >
| > # 3.0
| > def extract(iterable, indexes):
| > # assume indexes are all legal
and in order, I wrote once, but seem to have erased in revising (frown)
| > enext = enumerate(iterable).__next__
| > i,item = enext()
| > for index in indexes:
| > while i < index:
| > i,item = enext()
| > yield item
| >
| > import time
| > print(list(extract(time.localtime(), (0,2))))
| >
| > #prints [2008, 12]
|
| but extract('python', (3, 1)) won't work!
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