Removing sublists from a list in Python

Question

I have a list C. I want to remove all sublists which have length 7. But I am getting an error. I present the expected output.

C = [[0, 2, 3, 5], [1, 3, 4, 6], [2, 0, 3, 5], [3, 0, 1, 2, 4, 5, 6], [8, 5, 6, 7, 9, 10, 11]]

for i in range(0,len(C)):
    if(len(C[i])==7):
        C.remove(C[i])

The error is

 in <module>
    if(len(C[i])==7):

IndexError: list index out of range

The expected output is

[[0, 2, 3, 5], [1, 3, 4, 6], [2, 0, 3, 5]]

Asked By: rajunarlikar123

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Source

Answer 1

You are modifying the list you are iterating on, so after you have removed an element, your example list only has length 4, which is why you get this error. To solve this, you need to use an auxiliary list:

result = []
for sublist in C:
    if len(sublist) != 7:
        result.append(sublist)

or you can use the builtin filter:

list(filter(lambda x: len(x)!= 7, C))

Answered By: Florent Monin

Answer 2

C = [[0, 2, 3, 5], [1, 3, 4, 6], [2, 0, 3, 5], [3, 0, 1, 2, 4, 5, 6], [8, 5, 6, 7, 9, 10, 11]]

new_C = [item for item in C if len(item) != 7]

Answered By: BoroBoro

Removing sublists from a list in Python

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