Python: How to remove empty lists from a list? [duplicate]
I have a list with empty lists in it:
list1 = [[], [], [], [], [], 'text', 'text2', [], 'moreText']
How can I remove the empty lists so that I get:
list2 = ['text', 'text2', 'moreText']
I tried list.remove('') but that doesn't work.
Try
list2 = [x for x in list1 if x != []]
If you want to get rid of everything that is "falsy", e.g. empty strings, empty tuples, zeros, you could also use
list2 = [x for x in list1 if x]
You can use filter()
instead of a list comprehension:
list2 = filter(None, list1)
If None
is used as first argument to filter()
, it filters out every value in the given list, which is False
in a boolean context. This includes empty lists.
It might be slightly faster than the list comprehension, because it only executes a single function in Python, the rest is done in C.
Calling filter
with None
will filter out all falsey values from the list (which an empty list is)
list2 = filter(None, list1)
>>> list1 = [[], [], [], [], [], 'text', 'text2', [], 'moreText']
>>> list2 = [e for e in list1 if e]
>>> list2
['text', 'text2', 'moreText']
A few options:
filter(lambda x: len(x) > 0, list1) # Doesn't work with number types
filter(None, list1) # Filters out int(0)
filter(lambda x: x==0 or x, list1) # Retains int(0)
sample session:
Python 2.7.1 (r271:86832, Nov 27 2010, 17:19:03) [MSC v.1500 64 bit (AMD64)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
>>> list1 = [[], [], [], [], [], 'text', 'text2', [], 'moreText']
>>> filter(lambda x: len(x) > 0, list1)
['text', 'text2', 'moreText']
>>> list2 = [[], [], [], [], [], 'text', 'text2', [], 'moreText', 0.5, 1, -1, 0]
>>> filter(lambda x: x==0 or x, list2)
['text', 'text2', 'moreText', 0.5, 1, -1, 0]
>>> filter(None, list2)
['text', 'text2', 'moreText', 0.5, 1, -1]
>>>
I found this question because I wanted to do the same as the OP. I would like to add the following observation:
The iterative way (user225312, Sven Marnach):
list2 = [x for x in list1 if x]
Will return a list
object in python3
and python2
. Instead the filter way (lunaryorn, Imran) will differently behave over versions:
list2 = filter(None, list1)
It will return a filter
object in python3
and a list
in python2
(see this question found at the same time). This is a slight difference but it must be take in account when developing compatible scripts.
This does not make any assumption about performances of those solutions. Anyway the filter object can be reverted to a list using:
list3 = list(list2)
list1 = [[], [], [], [], [], 'text', 'text2', [], 'moreText']
list2 = []
for item in list1:
if item!=[]:
list2.append(item)
print(list2)
output:
['text', 'text2', 'moreText']
a = [[1,'aa',3,12,'a','b','c','s'],[],[],[1,'aa',7,80,'d','g','f',''],[9,None,11,12,13,14,15,'k']]
b=[]
for lng in range(len(a)):
if(len(a[lng])>=1):b.append(a[lng])
a=b
print(a)
Output:
[[1,'aa',3,12,'a','b','c','s'],[1,'aa',7,80,'d','g','f',''],[9,None,11,12,13,14,15,'k']]
Adding to the answers above, Say you have a list of lists
of the form:
theList = [['a','b',' '],[''],[''],['d','e','f','g'],['']]
and you want to take out the empty entries from each list as well as the empty lists you can do:
theList = [x for x in theList if x != ['']] #remove empty lists
for i in range(len(theList)):
theList[i] = list(filter(None, theList[i])) #remove empty entries from the lists
Your new list will look like
theList = [['a','b'],['d','e','f','g']]
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