How to make multiple list from one list in python

Question

I want to make the multiple list from one list on condition base.

Actual data:

numbers = [1, 2, 3,4,5,6,7,8,9, 1, 11, 12, 13, 1, 21, 22, 25, 6, 1, 34 ,5 ,6 ,7,78]

Expected outcome:

[1, 2, 3,4,5,6,7,8,9]
[1, 11, 12, 13]
[1, 21, 22, 25, 6]
[1, 34 ,5 ,6 ,7,78]

Here is my attempt:

list_number=[]
numbers = [1, 2, 3,4,5,6,7,8,9, 1, 11, 12, 13, 1, 21, 22, 25, 6, 1, 34 ,5 ,6 ,7,78]
for x in numbers:
    if x==1:
        list_number.append(numbers)

print list_number[0]

' list_number=[] numbers = [1, 2, 3,4,5,6,7,8,9, 1, 11, 12, 13, 1, 21, 22, 25, 6, 1, 34 ,5 ,6 ,7,78] for x in numbers: if x==1: list_number.append(numbers) print list_number[0] ' — Adnan Ghaffar
– Adnan Ghaffar, Commented Dec 31, 2015 at 12:14
@TigerhawkT3 1 is a separator and I am supposed to creates new list when it start from 1. — Adnan Ghaffar
– Adnan Ghaffar, Commented Dec 31, 2015 at 12:16

TigerhawkT3 · Accepted Answer · 2015-12-31 12:20:30Z

5

Rather than adding new references/copies of the original numbers to the list, either start a new list whenever you see a 1 or add to the latest one otherwise:

list_number = []
numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 11, 12, 13, 1, 21, 22, 25, 6, 1, 34, 5, 6, 7, 78]
for x in numbers:
    if x==1:
        list_number.append([1])
    else:
        list_number[-1].append(x)

print list_number

Result:

>>> for x in list_number:
...     print x
...
[1, 2, 3, 4, 5, 6, 7, 8, 9]
[1, 11, 12, 13]
[1, 21, 22, 25, 6]
[1, 34, 5, 6, 7, 78]

answered Dec 31, 2015 at 12:20

TigerhawkT3

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Comments

Ezer K · Accepted Answer · 2015-12-31 12:35:05Z

0

My suggestion is a 2 stepper, first find the indices of the ones, then print from one to the other and from the last to the end:

 ones_index=[]
 numbers = [1, 2, 3,4,5,6,7,8,9, 1, 11, 12, 13, 1, 21, 22, 25, 6, 1, 34 ,5 ,6 ,7,78]
 for i,x in enumerate(numbers):
     if x==1:
         ones_index.append(i)

for i1,i in enumerate(ones_index):
     try:
         print numbers[i:ones_index[i1+1]]
    except:
         print numbers[i:]

answered Dec 31, 2015 at 12:35

Ezer K

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