for root, dirs, files in os.walk(rasterfolder):
		print root
		print join(root, file) for file in files

print join(root, file) for file in files

for root, dirs, files in os.walk(rasterfolder):
	for file in files:
	    print os.path.join(root, file)

	for root, dirs, files in os.walk(rasterfolder):
		for file in files:
			listofimages = [file]
			for image in listofimages:
				print image	

for root, dirs, files in os.walk(rasterfolder):
    pass
    
print files

['101_018696_0_0_01_bsq.img', '101_018696_0_0_02_bsq.img', '101_018696_0_0_03_bsq.img']
['234321786.txt', '468312234.txt']
[] <-- пустая директория
[] <-- пустая директория

list_path = []
for root, dirs, files in os.walk(rasterfolder):
    for file in files:
        full_path = os.path.join(root, file)
        list_path.append(full_path)
print list_path

import os
from functools import partial
list_path = []
for root, _, files in os.walk(rasterfolder):
    full_path = partial(os.path.join, root)
    list_path.extend(map(full_path, files))

for root, files in os.walk(raster folder)[::2]:
     ...

import os
rasterfolder = "/home/serg/a"
obj = os.walk(rasterfolder)[::2]