delete string with certain values from list in python

Question

i have list

my_list = ['Cat Dog Tiger Lion', 'Elephant Crocodile Monkey', 'Pantera Cat Eagle Hamster']

i need to delete all of elements which containing sub = 'Cat'

so i need to have output

['Elephant Crocodile Monkey']

i think i need to do something with regex, maybe re.compile to find this values and then drop them from my_list?

i have been tryed:

for string in my_list:
    if string.find(sub) is not -1:
        print("this string have our sub")
    else:
        print("sthis string doesnt have our sub")

but i dont know how to combine it with delete this rows from my_list

yatu · Accepted Answer · 2020-03-13 12:53:04Z

2

To filter lists, a simple approach is to use a list comprehension:

[i for i in my_list if 'Cat' not in i]
# ['Elephant Crocodile Monkey']

Which is equivalent to:

out = []
for i in my_list:
    if 'Cat' not in i:
        out.append(i)

answered Mar 13, 2020 at 12:53

yatu

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1 Comment

JvdV Over a year ago

Nice @yatu. Would this als cater for Cat being a substring though? I am keen to learn on how you would adapt your answer to make it work when Cat would be a substring of Caterpillar. I've added an answer myself but I feel that it can be done much simpler.

Pragya · Accepted Answer · 2020-03-13 12:54:44Z

2

Here's your list:

my_list = ['Cat Dog Tiger Lion', 'Elephant Crocodile Monkey', 'Pantera Cat Eagle Hamster']

You can use list comprehension for filtering the list:

new_list = [x for x in my_list if(not x.__contains__('Cat'))]

answered Mar 13, 2020 at 12:54

Pragya

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2 Comments

JvdV Over a year ago

For learning purposes. Could you explain the main differences between not in as per @yatu his answer and your not contains method?

Pragya Over a year ago

The in keyword calls the __contains__ method of the object. I realize that in is more preferable as it is easier than method-call syntax. However, both of them give the same result.

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