如何一致地对 Python 中的字符串的第一个和最后一个字符进行切片 3

Question

I need help with writing a loop that can slice through a string, taking away the first and last character. I understand that the slice [0:-1] can target those two positions, but I need a way for it to iterate through the whole string. Here is a little snippet into what the output would ideally look like:

Input (min for length is 3):

string = 'ABCDEFGHI'

Output:

['ABCDEFGHI', 'BCDEFGH', 'CDEFG']

I would be grateful for any guidance/advice!

Answer 1

Try this:

>>> [string[i:len(string)-i] for i in range(3)]
['ABCDEFGHI', 'BCDEFGH', 'CDEFG']

Answer 2

Here's a function you can use:

def foo(string, limit=None):
    output = [string]
    i = 0
    if limit == None:
        while i < len(string) / 2 - 1:
            output.append(output[-1][1:-1])
            i += 1
    else:
        while i < limit - 1:
            output.append(output[-1][1:-1])
            i += 1
    return output

The second parameter can be used to set a limit to the length of the array. It is optional.