Access item in a list of lists

Question

If I have a list of lists and just want to manipulate an individual item in that list  how would I go about doing that   For example    List1     10 13 17   3 5 1   13 11 12     What if I want to take a value  say 50  and look just at the first sublist in List1  and subtract 10  the first value   then add 13  then subtract 17

User · Answer

for l in list1      val   50 - l 0    l 1  - l 2      print  val    val   Loop through list and do operation on the sublist as you wanted

User · Answer

List1     10 -13 17   3 5 1   13 11 12    num   50 for i in List1 0  num -  i print num

User · Answer

50 - List1 0  0    List 0  1  - List 0  2    List 0  gives you the first list in the list  try out print List 0    Then  you index into it again to get the items of that list  Think of it this way   List1 0   0

User · Answer

You can access the elements in a list-of-lists by first specifying which list you re interested in and then specifying which element of that list you want  For example  17 is element 2 in list 0  which is list1 0  2     gt  gt  gt  list1     10 13 17   3 5 1   13 11 12    gt  gt  gt  list1 0  2  17   So  your example would be  50 - list1 0  0    list1 0  1  - list1 0  2

User · Answer

You can use itertools cycle    gt  gt  gt  from itertools import cycle  gt  gt  gt  lis     10 13 17   3 5 1   13 11 12    gt  gt  gt  cyc   cycle  -1  1    gt  gt  gt  50   sum x next cyc  for x in lis 0       lis 0  is  10 13 17  36   Here the generator expression inside sum would return something like this    gt  gt  gt  cyc   cycle  -1  1    gt  gt  gt   x next cyc  for x in lis 0    -10  13  -17    You can also use zip here    gt  gt  gt  cyc   cycle  -1  1    gt  gt  gt   x y for x  y  in zip lis 0   cyc    -10  13  -17

User · Answer

This code will print each individual number   for myList in   10 13 17   3 5 1   13 11 12        for item in myList          print item    Or for your specific use case     50 - List1 0  0     List1 0  1   - List1 0  2

[python] Access item in a list of lists

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