Listing files with glob.

[MathCommander]

Hi. I have a directory wich contains a set of files with the following format

"name" + "six digits number" + ".txt"

The following names are examples of this format

dog000001.txt

cat000054.txt

lion010101.txt

mouse123456.txt

I have to make a list of all the files whose end number belongs to an interval. To get this, I have used the following instruction

files_list = glob.glob('*' + '[' + initial + '-' + final + ']' + '.txt')

where initial and final are the left and right boundaries of the interval, respectively. For example, if I execute the before instruction with

initial = '000000'

final = '010000'

the execution would return to me the following result

files_list = [dog000001.txt, cat000054.txt]

but it doesn't occur. I have tried using ranges too but the range doesn't consider 6 digits if the number has less than 6 digits.

Can anybody help me?

Thanks.