Assign image names in folder to images in other folder.

[snippsat]

also the following code is not assigning images in ascending order
Order of images is important for input to my Algorithm,

It can be wrong if just sort the strings,it's called natural sorting(human sorting).
So i guess you want to sort after floating value in string.

import re
from pprint import pprint

def try_float(text):
    try:
        return float(text)
    except ValueError:
        text

def natural(text):
    return [try_float(c) for c in re.split('(\d+.\d+)', text)]

lst = [
    '1305031102.975304.png',
    '1305031102.211214.png',
    '1305031102.243211.png',
    '1305031102.275326.png',
    '1305031102.311267.png',
    '1305031102.343233.png',
    '1305031102.375329.png',
    '1305031102.411258.png',
    '1305031102.443271.png',
]

lst.sort(key=natural)
pprint(lst)

Output:
['1305031102.211214.png',
 '1305031102.243211.png',
 '1305031102.275326.png',
 '1305031102.311267.png',
 '1305031102.343233.png',
 '1305031102.375329.png',
 '1305031102.411258.png',
 '1305031102.443271.png',
 '1305031102.975304.png']

See that i changed '1305031102.975304.png'
Now it's largest float value an are last is list.