Thank you Steve and MRAB, This is what I was looking for:
[[v.append(j) for j in i if j != 0] for i in self.value] the value is actually stored as a string so I would need to check if it is "0". I do have one more question about list comprehension though. After doing this I get an unwanted list of None how do I make it disappear or not return this list. Would I have to be modifying it in place for this to happen? Wouldn't modifying it in place potentially overwrite some other values? I just don't want it to return [[None], [None, None], [None, None], [None]] You guys rock, thanks for helping me learn python. On Sat, Jan 3, 2009 at 2:09 AM, Steve Holden <st...@holdenweb.com> wrote: > alex goretoy wrote: > > Hello All, > > > > I'm doing this in my code > > > > [[v.append(j) for j in i] for i in self.value] > > > > if works and all, but I need to add a if statement in the mix. Can't > > seem to remember the syntax to do so and everything I've tried seems to > > fail. How do I add a check to see if j is not int("0") then append to v > > list? Thank you in advance. -A > > Who, tiger. It "works" for a value of "works" that involves creating two > lists. One is the one you want, referenced by v, and the other is the > value if the list comprehension, which will be a list full of lists of > all the None values returned by those append() calls. But I presume you > are throwing that second list away ... > > See, a list comprehension is intended to create a list. So what you > should have used (assuming v was the empty list before you started) was > > v = [[j for j in i] for i in self.value] > > Further, when you say 'j is not int("0")', do you actually mean that a > is not in integer with the value 0? Assuming you do then what you need is > > v = [[j for j in i if not j] for i in self.value] > > or, more pedantically > > v = [[j for j in i if j==0] for i in self.value] > > regards > Steve > -- > Steve Holden +1 571 484 6266 +1 800 494 3119 > Holden Web LLC http://www.holdenweb.com/ > > -- > http://mail.python.org/mailman/listinfo/python-list > -- А-Б-В-Г-Д-Е-Ё-Ж-З-И-Й-К-Л-М-Н-О-П-Р-С-Т-У-Ф-Х-Ц-Ч-Ш-Щ-Ъ-Ы-Ь-Э-Ю-Я а-б-в-г-д-е-ё-ж-з-и-й-к-л-м-н-о-п-р-с-т-у-ф-х-ц-ч-ш-щ-ъ-ы-ь-э-ю-я
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