import codecs

b = bytes.fromhex('41 F5 42 43 F4')
print(ascii(b.decode('utf8', 'replace')))
fout = open('temp.bin', 'wb')
fout.write(b)
fout.close()
s=codecs.open('temp.bin', encoding='utf8', errors='replace').read()
print(ascii(s))