Add a '.' for every string in a list of lists, if string[-1] != '.'

Question

I have a list of lists like this:

text_lst = [['this is a string.','this is a string2'],['this is not a string'],['this is a string with numbers!','that is all!']]

I need to add a . for every string that does not end with a .. Below is my code:

new_lst = []
for x in text_lst:
    for x1 in x:
        if x1[-1] != '.':
            new_lst.append(x1 + '.')
        else:
            new_lst.append(x1)

However, it returns a weird combination of strings and list:

[['this is a string.', 'this is a string2'],
 'this is a string2.',
 'this is not a string.',
 'this is a string with numbers!.',
 'that is all!.']

I’m expecting this type of result:

[['this is a string.', 'this is a string2.'],
 ['this is not a string.'],
 ['this is a string with numbers!', 'that is all!']]

Can you kindly let me know what did I do wrong?

Edit:
I used the wrong variable, instead of appending x1, I append x. Here’s the result:

['this is a string.',
 'this is a string2.',
 'this is not a string.',
 'this is a string with numbers!.',
 'that is all!.']

However, any suggestion on how to preserve the list of lists format like the original one?

Asked By: mhutagalung

||

Source

Answer 1

Let’s first learn how to add a dot to a text:

def add_dot(text):
    if text.endswith(("!", ".")):
        return text
    return text + "."

Once we have this function, we can combine it with list comprehension:

[
    [add_dot(text) for text in inner_list]
    for inner_list in text_lst
]

Given your sample input, the output will be:

[['this is a string.', 'this is a string2.'],
 ['this is not a string.'],
 ['this is a string with numbers!', 'that is all!']]

Answered By: Hai Vu

Add a '.' for every string in a list of lists, if string[-1] != '.'

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