import os
from os.path import isfile
import glob
fo=open("file.txt")
for h in fo:
    if h.startswith("key"):
        print(h)
        print(h.find("can"))    #find(str,num) starts find after that index

#os.mkdir("amit")
lis=os.listdir("G:\\")
for i in  lis:
    i="G:\\"+i
    if not isfile(i):
        print(i)

for filename in glob.iglob('G:/*.txt', recursive=True):
    print(filename)