search binary file and list all founded keyword offset

[Pyguys]

search binary file and list all founded keyword offset

with open('1.bin', 'rb') as f:
        s = f.read()
    k = s.find(b'\xFF\x00')
    for list in k:
        print(list)

and i got error

TypeError:'int' object in not interable. 

please help. thanks.