字符串 字节

a. 字符串转字节

key = "xxxx"
bkey = bytes(key,encoding='utf-8')

b. bytearray 数组

data = "要加密"
ba_data = bytearray(data,encoding="utf-8")
print(ba_data)
    # bytearray(b'\xe8\xa6\x81\xe5\x8a\xa0\xe5\xaf\x86')
print(len(ba_data))
    # 9
ba_data.append(11)      #只能追加数字,默认转成字节