input_file, output_file = None, None

input_string = ""

input_file = open("testfilefolder\data2", "rb")

output_file = open("testfilefolder\data3", "wb")

while True:

input_string = input_file.read(1)

if not input_string:

break

output_file.write(input_string)

input_file.close()

output_file.close()