Delete Items From List Of List: Pythonic Way

I've this kind of list of list (only two nested level): my_list = [['A'], ['B'], ['C','D','A','B'], ['E'], ['B', 'F', 'G'], ['H']] I've a list of items to delete in my_list: to_del

Solution 1:

Try list comprehension:

my_list = [[x for x in sublist if x not in to_del] for sublist in my_list]

Output:

>>> my_list
[[], [], ['C', 'D'], ['E'], ['F', 'G'], ['H']]

Solution 2:

With nested list comprehensions:

[[y foryin x if y not in to_del] forxin my_list]

With list comprehension and lambda filter:

[filter(lambda y: y notin to_del, x) for x in my_list]

An attempt for the general case of arbitrarily nested lists:

deff(e):
    ifnotisinstance(e,list):
        if e notin to_del:
            return e
    else:
        returnfilter(None,[f(y) for y in e])

to_del = ['A','B']
my_list= [['A'], ['B',['A','Z', ['C','Z','A']]], ['C','D','A','B'],['E'], ['B','F','G'], ['H']]

>>> f(my_list)
[[['Z', ['C', 'Z']]], ['C', 'D'], ['E'], ['F', 'G'], ['H']]