Shashank Singh, 26.05.2010 21:48:
What is the most efficient way of applying a function to all the elements of
an iterable while discarding the
result (i.e. operations are done only for side-effects).
For example if I want to save all elements in a list of items (and am not
interested in what save() returns), the
simplest way is:
itemlist = [i1, i2, i3....]
for item in itemlist: item.save()
It might be squeezing too much but is it possible to do it more efficiently
by pushing the looping inside the C code
and achieve some gains as is done by using map in place of a for loop when
the return values need to be saved?
If all items have the exact same type, you can get away with an unbound method:
class MyType(object):
...
def safe(self):
...
itemlist = [ MyType() for i in range(20) ]
# this is what you want:
from itertools import imap
for _ in imap(MyType.save, itemlist): pass
But some people may consider this too ugly to actually use in real code.
Stefan
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