Way to ignore case in iteration of glob

Question

Is there a simpler way to do the following to iterate over xls files regardless of capitalization?

for file in [glob.glob(os.path.join(dir, '*.xls')), glob.glob(os.path.join(dir, '*.XLS'))]:

Answer 1

glob and the underlying fnmatch have no flag for case-independence, but you can use brackets:

for file in glob.iglob(os.path.join(dir, '*.[xX][lL][sS]')):

Answer 2

You could do the matching "manually" without glob:

for file in os.listdir(dir):
    if not file.lower().endswith('.xls'):
        continue
    ...