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 Help With While Loop and Append laprus Programmer named Tim Posts: 6 Threads: 1 Joined: Jan 2019 Reputation: 0 Likes received: 0 #11 Feb-06-2019, 05:55 AM Ok so numbers, strings, and tuples are immutables, but lists are mutable. There was this example in link: nums = [1, 2, 3] other = nums nums.append(4) print(other) ## 1, 2, 3, 4 is there any way where I can transfer only values of nums to other. like only values of one list of numbers to the values of second list of numbers without linkining them. cause I'll be using the main list repeatedly? perfringo Verb Conjugator Posts: 652 Threads: 1 Joined: Jun 2018 Reputation: 57 Likes received: 131 #12 Feb-06-2019, 08:01 AM (This post was last modified: Feb-06-2019, 08:01 AM by perfringo. Edited 1 time in total.) (Feb-06-2019, 05:55 AM)laprus Wrote: is there any way where I can transfer only values of nums to other. like only values of one list of numbers to the values of second list of numbers without linkining them. cause I'll be using the main list repeatedly? ```In [1]: nums = [1, 2, 3] In [2]: other = nums[:] # slice In [3]: id(nums) Out[3]: 4384668552 In [4]: id(other) Out[4]: 4383868296 In [5]: nums.append(4) In [6]: nums Out[6]: [1, 2, 3, 4] In [7]: other Out[7]: [1, 2, 3] ```You should keep in mind that it is only one level deep. Meaning that if list elements are mutable then slice is mutating as well: ```In [8]: nums = [[1], [2], [3]] In [9]: other = nums[:] In [10]: nums[-1].append(4) In [11]: nums Out[11]: [[1], [2], [3, 4]] In [12]: other Out[12]: [[1], [2], [3, 4]] ```There is of course built-in module copy for deep copies. For complete picture one additional example of expected behaviour: ```In [13]: del nums[-1] In [14]: nums Out[14]: [[1], [2]] In [15]: other Out[15]: [[1], [2], [3, 4]] ``` I'm not 'in'-sane. Indeed, I am so far 'out' of sane that you appear a tiny blip on the distant coast of sanity. Bucky Katt, Get Fuzzy Life of Brian: Conjugate the verb, "to go" ! laprus Programmer named Tim Posts: 6 Threads: 1 Joined: Jan 2019 Reputation: 0 Likes received: 0 #13 Feb-07-2019, 04:58 AM Thanks. I tried your code in python and that works just as I needed. I guess I was looking for ':' operator. I didn't understand why you wrote 'In' and 'Out' at every alternate line. I had to delete the code in python for it to work. perfringo Verb Conjugator Posts: 652 Threads: 1 Joined: Jun 2018 Reputation: 57 Likes received: 131 #14 Feb-07-2019, 07:04 AM (Feb-07-2019, 04:58 AM)laprus Wrote: I didn't understand why you wrote 'In' and 'Out' at every alternate line. I had to delete the code in python for it to work. Sorry about that. This is not 'me', it's ipython who does it on my behalf . I use interactive interpreter in terminal for one-liners/short code examples and if I copy from there it is how ipython displays it. If you are interested you can have a look at Project Jupyter which provides notebook functionality on top of ipython. I don't expect oneliners to be copied. I strongly recommend that you enter them yourself. There are several reasons for that: getting comfortable with writing code, muscle memory, you have possibility to understand/learn keywords, functions, methods etc. Nowadays, to be 'computer literate' you must be able to type at least 200 strokes per minute so for one-liners it is much faster to type instead of copying. I'm not 'in'-sane. Indeed, I am so far 'out' of sane that you appear a tiny blip on the distant coast of sanity. Bucky Katt, Get Fuzzy Life of Brian: Conjugate the verb, "to go" ! « Next Oldest | Next Newest »

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