Girish Sahani wrote: > Btw going slightly off-topic, when i try to run a code like below with > around 50 elements (pairs) in l4,python just hangs. Any ideas why this is > happening...the data is not that large :((
building a filtered new list by repeatedly removing stuff from a copy of the original list isn't exactly the fastest way to do things, but there's no way the following code will "hang" with 50 items instead of 10, unless your computer is ludicrously slow (it takes about 0.000113 seconds on my machine). maybe you meant to write 50k items ? (11 seconds on my machine) >> pairList = [[1,2],[3,4],[3,5],[3,6],[9,7],[8,9],[8,7],[7,9],[11,10]] >> l4 = >> [[4,2],[4,7],[4,10],[4,12],[9,2],[9,7],[9,10],[9,12],[11,2],[11,7]] >> for pair in l4[:]: >> if pair not in pairList: >> l4.remove(pair) >> print "l4 is",l4 </F> -- http://mail.python.org/mailman/listinfo/python-list
