python二进制串转字符串的方法详解

In [1]: s = 'hello world'

In [2]: s.encode('ascii')
Out[2]: b'hello world'

In [3]: type(s)
Out[3]: str

In [4]: type(s.encode('ascii'))
Out[4]: bytes

In [5]: b = s.encode('ascii')

In [6]: b
Out[6]: b'hello world'

In [7]: str(b)
Out[7]: "b'hello world'"

In [8]: b.decode('utf-8')
Out[8]: 'hello world'

b'\xe5\x93\x88\xe5\x96\xbd'

In [15]: b
Out[15]: b'\xe5\x93\x88\xe5\x96\xbd'

In [16]: b.decode('utf-8')
Out[16]: '哈喽'

b'{"errno":0,"data":[{"k":"\\u5468\\u6770\\u4f26","v":"\\u540d. Jay Chou; The New King of Asian Pop \\u4ee3. \\u65e0\\u4e0e\\u4f26\\u6bd4"}]}'

In [17]: b'{"errno":0,"data":[{"k":"\\u5468\\u6770\\u4f26","v":"\\u540d. Jay Cho
    ...: u; The New King of Asian Pop \\u4ee3. \\u65e0\\u4e0e\\u4f26\\u6bd4"}]}'
    ...: .decode('unicode_escape')
Out[17]: '{"errno":0,"data":[{"k":"周杰伦","v":"名. Jay Chou; The New King of Asian Pop 代. 无与伦比"}]}'

In [20]: json.loads(b'{"errno":0,"data":[{"k":"\\u5468\\u6770\\u4f26","v":"\\u540d. Jay Chou; The New King of Asian Pop \\u
    ...: 4ee3. \\u65e0\\u4e0e\\u4f26\\u6bd4"}]}')
Out[20]: 
{'errno': 0,
 'data': [{'k': '周杰伦', 'v': '名. Jay Chou; The New King of Asian Pop 代. 无与伦比'}]}