bytes
s1 = 'alex'
b1 = b'alex'
print(b1,type(b1))
print(b1.upper())
s1 = b'屌丝'
b1 = s1.encode('utf-8')
print(s1)
s1 = '太白'
unicode ---> gbk 字符串 ---> gbk编码方式的bytes
b1 = s1.encode('gbk') # 编码
s2 = b1.decode('gbk') # 解码
print(s2)

s2 = '太白'
unicode ---> utf-8  字符串 ---> utf-8 编码方式的bytes
b2 = s2.encode('utf-8')
s3 = b2.decode('utf-8')
print(s3)

gbk ---> utf-8

b1 = b'\xcc\xab\xb0\xd7'  # gbk编码的bytes类型
s = b1.decode('gbk')
b2 = s.encode('utf-8')  # utf-8编码的bytes类型
print(b2)

s1 = 'いらないよ'
b = s1.encode('shift_jis')  #
s2 = b.decode('shift_jis')
# print(b)
print(s2)