PYTHON remove elements from nested lists -

i have array of arrays this

dataset = [['387230'], ['296163'], ['323434', '311472', '323412', '166282'], ['410119']] 

i delete element '311472' not know how. have tried

for set in dataset:     item in set:         if item=="311472":             dataset.remove(item) 

but not work

the result should be:

[['387230'], ['296163'], ['323434', '323412', '166282'], ['410119']] 

use nested list comprehension, retaining elements instead:

dataset = [[i in nested if != '311472'] nested in dataset] 

demo:

>>> [[i in nested if != '311472'] nested in dataset] [['387230'], ['296163'], ['323434', '323412', '166282'], ['410119']] 

your mistake remove item dataset instead, if removed elements set you'd end modifying list in place while iterating on it, means further iteration skip elements:

>>> lst = ['323434', '311472', '311472', '323412', '166282'] >>> in lst: ...     if == '311472': ...         lst.remove(i) ...  >>> lst ['323434', '311472', '323412', '166282'] 

that's because list iterator moves next index regardless of later additions or deletions list; when removing first '311472' @ index 1 loop moves on index 2 in list past index 1 has moved down spot.