python Programming Glossary: seq

List filtering: list comprehension vs. lambda + filter

http://stackoverflow.com/questions/3013449/list-filtering-list-comprehension-vs-lambda-filter

instead of a list comprehension def filterbyvalue seq value for el in seq if el.attribute value yield el Then in your.. a list comprehension def filterbyvalue seq value for el in seq if el.attribute value yield el Then in your main code which..

Comprehension for flattening a sequence of sequences?

http://stackoverflow.com/questions/457215/comprehension-for-flattening-a-sequence-of-sequences

for flattening a sequence of sequences If I have sequence of sequences maybe a list.. for flattening a sequence of sequences If I have sequence of sequences maybe a list of tuples.. for flattening a sequence of sequences If I have sequence of sequences maybe a list of tuples I can use itertools.chain..

How do you remove duplicates from a list in Python whilst preserving order?

http://stackoverflow.com/questions/480214/how-do-you-remove-duplicates-from-a-list-in-python-whilst-preserving-order

plog uniqifiers benchmark Fastest one def f7 seq seen set seen_add seen.add return x for x in seq if x not in.. def f7 seq seen set seen_add seen.add return x for x in seq if x not in seen and not seen_add x EDIT If you plan on using..

Rolling or sliding window iterator in Python

http://stackoverflow.com/questions/6822725/rolling-or-sliding-window-iterator-in-python

I need a rolling window aka sliding window iterable over a sequence iterator generator. Default Python iteration can be considered.. or more efficient method for doing this def rolling_window seq window_size it iter seq win it.next for cnt in xrange window_size.. for doing this def rolling_window seq window_size it iter seq win it.next for cnt in xrange window_size # First window yield..

Python: find first element in a sequence that matches a predicate

http://stackoverflow.com/questions/8534256/python-find-first-element-in-a-sequence-that-matches-a-predicate

find first element in a sequence that matches a predicate Stupid question ahead I want.. a predicate. The current code is quite ugly x for x in seq if predicate x 0 I've thought about changing it to from itertools.. import dropwhile dropwhile lambda x not predicate x seq .next But there must be something more elegant... And it would..