Feature Requests item #1726707, was opened at 2007-05-28 04:51
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: paul rubin (phr)
Assigned to: Nobody/Anonymous (nobody)
Summary: add itertools.ichain function and count.getvalue
Initial Comment:
def ichain(seq):
for s in seq:
for t in s: yield t
This is like itertools.chain except seq is lazy-evaluated element-by-element.
Obvious use cases:
# equivalent of perl's "while (<>) { ... } "
for line in ichain(all_lines_of(f) for f in list_of_filenames):
do_something_with(line)
# generate infinite sequence 1,1,1,2,2,2...
seq = ichain(repeat(i,3) for i in count(1))
Also requested: it would be nice to be able to get the current counter value
from a count() instance without incrementing it, e.g.
c = count()
...
i = c.getvalue()
This is clearly useful since repr(c) does something like that internally.
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