On 07/05/2011 02:43, Jon Clements wrote:
On May 7, 12:51 am, Ian Kelly<ian.g.ke...@gmail.com> wrote:
On Fri, May 6, 2011 at 4:21 PM, Philip Semanchuk<phi...@semanchuk.com> wrote:
What if it's not a list but a tuple or a numpy array? Often I just want to
iterate through an element's items and I don't care if it's a list, set, etc.
For instance, given this function definition --
def print_items(an_iterable):
if not an_iterable:
print "The iterable is empty"
else:
for item in an_iterable:
print item
I get the output I want with all of these calls:
print_items( list() )
print_items( tuple() )
print_items( set() )
print_items( numpy.array([]) )
But sadly it fails on iterators:
print_items(xrange(0))
print_items(-x for x in [])
print_items({}.iteritems())
My stab:
from itertools import chain
def print_it(iterable):
it = iter(iterable)
try:
head = next(it)
except StopIteration:
print 'Empty'
return
for el in chain( (head,), it ):
print el
Not sure if I'm truly happy with that though.
How about:
def print_items(an_iterable):
found_item = False
for item in an_iterable:
print item
found_item = True
if not found_item:
print "The iterable was empty"
-- HansM
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