Click here to Skip to main content
14,732,788 members
Please Sign up or sign in to vote.
0.00/5 (No votes)
See more:
I want to remove zero values from a list in python. I've tried some codes but it still shows the zero values. Here is my list.

In [128]: allData
[['Brand', 'Type', 'Release'],
 ['Nissan', 'seDan', '2010'],
 ['Hyundae', 'suv', '2011'],
 ['BMW', 'seDan', '2012'],
 ['Hyun dae', 'seDan', '2012'],
 ['BMW', 'suv', '2012'],
 ['BMW', 'suv', '0']]

The below code what I've tried is a part of the full script.
Please help me to solve the issue.
Thank you.

What I have tried:

import csv
import os

fileToRead = "est1.csv"

f = open(fileToRead, 'r')
reader = csv.reader(f)
allData = list(reader)
totalCols = len(attributes)
totalRows = len(allData)

# Add a '0' for each empty cell
for j in range(0,totalCols):
	for i in range(0,totalRows):
		if 0 == len(allData[i][j]):
			allData[i][j] = "0"
# Remove zero value
for j in range(0,totalCols):
	for i in range(0,totalRows):
		list(filter(lambda a: a !="0", allData[i]))
Updated 19-Aug-20 1:43am

You start by replacing 0 by "0" - which is not necessary. Secondly your filter call does not save the resulting list; try:
allData[i] = list(filter(lambda a: a !=0, allData[i]))
Member 14738587 9-Feb-20 22:17pm
Thank you so much for your help. It works! Thank you.
I just saw the solutions posted.

Python is known for the ability to compress number of lines of code and it is certainly the way you write code in C/C++ or java.

You can use the concept of list comprehension - a unique feature of python and very popular among modern age python programmers.

Let's take an example:

say I define a list

>>> a = [1,2,0,3,0,5,6,7,0,10]

Now to remove all '0' in the list, just use "list comprehension" i.e.

>>> [x for x in a if x !=0]
[1, 2, 3, 5, 6, 7, 10]

Cool right !!

Hi, my solution remove everything you don't like in a list as follows, enjoy:

s1 = [2, 5.6, 0,"u", 78, 0, -3.6, 96, "t"]

s2 = [i for i in s1 if type(i) != str]
s1 = [i for i in s2 if type(i) != float]
s2 = [[i for i in s1 if i != 0]]

print(s2, end= " ")
while i<ll:
if="" a[i]="=0:
" del="" a[i]
="" print(a)
="" ll="ll-1
" i="0
" else:
="" print(a)<="" code="">

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

CodeProject, 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8 +1 (416) 849-8900