Python divide a list of ints on every recurring specific int in list

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How can I change a list like




by dividing it everytime there is a 0 in the list? I have tried many ways but they all take up too much lines to make sense (10 lines). I have looked at many list-splitting questions on stack overflow and I cant find anything that works.


I was asking if there was any way to do list.split(0) or something like that, but it appears that the answer is that there is no way to do that. I wanted to know if I can do it in one line or if there is any way I can use a common module. I have already tried doing it in multiple lines, it has worked, but I think it is inconvenient.


The code I tried was:

list = [30,20,0,48,20,10,20,0,30]  #1, 1 list
newlist = []                       #2, 2 lists
addinglist = []                    #3, 3 lists
for x in list:                     #4
    if x == 0:                     #5
        newlist.append(addinglist) #6
        addinglist = []            #7
    else:                          #8
        addinglist.append(x)       #9 
newlist.append(addinglist)         #10
list = newlist                     #11 lines, 3 lists.

The code requires 11 lines and 3 lists (one getting modified and the other two are useless).

This works:


for i in x:
    if i==0:

Where output is:

[[10, 20, 30], [4, 5, 6], [1, 1, 1, 1, 1, 1], [1]]

The code quite short, but I'm sure there are solutions that are more succinct.

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I wanted to know if I can do it in one line or if there is any way I can use a common module.

Yes, to both. You're trying to group data so groupby in itertools is your friend:

from itertools import groupby

data = [30, 20, 0, 48, 20, 10, 20, 0, 30]

result = [list(group) for non_zero, group in groupby(data, lambda n: n != 0) if non_zero]



> python3
[[30, 20], [48, 20, 10, 20], [30]]

We're using a key function to bundle the data based on whether it's zero or not. The group variable contains the bundles; the non_zero variable (aka key) is a boolean indicating if it's a bundle we want.

How to Use sorted() and sort() in Python – Real Python, In this example, a list of integers is defined, and then sorted() is called with the numbers We will cover the specific order of the output and why it is that way shortly: >>> >>> string_value = 'I like to sort' >>> sorted_string = sorted(​string_value.split()) > Each element in mixed_numbers has int() called on it to convert any str  The python function randint can be used to generate a random integer in a chosen interval [a,b]: >>> import random >>> random.randint(0,10) 7 >>> random.randint(0,10) 0 A list of random numbers can be then created using python list comprehension approach:

Computational Science and Its Applications – ICCSA 2019: 19th , The selection mechanism was accomplished through a Python® script. As such, each frequency was multiplied by 100 and rounded to an integer value. The list contained a unique identifier and a reference to a seat, repeated the This method consists in dividing the global volume into smaller elements until it is​  Because dividing two ints used to return an int (discarding the floating point part) and people freaked out about it enough that the default behavior of division changed from Python 2 to Python 3: [code]Python 2.7.14 (v2.7.14:84471935ed, Sep 16 20

(Tutorial) Python List Comprehension, Instead, you store all of these values in a Python list. be of the same type: they can be a combination of boolean, String, integer, float values. If you only want to extract expression for a specific set of data from the entire collection, First, you will define the expression that will divide the expression by 2;. Here is another surprise, In Python 3, ‘/’ operator does floating point division for both int and float arguments. # A Python 3 program to demonstrate use of # "/" for both integers and floating points print (5/2) print (-5/2) print (5.0/2) print (-5.0/2) Output: 2.5 -2.5 2.5 -2.5 Behavior of “//” is

3. An Informal Introduction to Python, 4 >>> (50-5*6)/4 5.0 >>> 8/5 # Fractions aren't lost when dividing integers 1.6 To do integer division and get an integer result, discarding any Strings can be concatenated (glued together) with the + operator, and repeated with *: are immutable, it is possible to change individual elements of a list:. Looking to modify an item within a list in Python? If so, I’ll show you the steps to accomplish this goal using a simple example. Steps to Modify an Item Within a List in Python Step 1: Create a List. To start, create a list in Python. For demonstration purposes, I created a list of names using this syntax:

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  • This can be shortened to final = [] and [final.append([]) if elem == 0 else final[-1].append(elem) for elem in [0]+x] using a list comprehension, and it will be two lines.