bytes([1,2,3,4,5,6,7,8,9])
bytes("python", 'ascii') # 字符串，编码

> website = 'http://www.169it.com/os'
> type(website)
<class 'str'>
> website
'http://www.169it.com/os'
>

> website_bytes_utf8 = website.encode(encoding="utf-8")
> type(website_bytes_utf8)
<class 'bytes'>
> website_bytes_utf8
b'http://www.169it.com/os'
> 

> website_bytes_gb2312 = website.encode(encoding="gb2312")
> type(website_bytes_gb2312)
<class 'bytes'>
> website_bytes_gb2312
b'http://www.169it.com/os'
>

> website_string = website_bytes_utf8.decode()
> type(website_string)
<class 'str'>
> website_string
'http://www.169it.com/os'
>
>

> website_string_gb2312 = website_bytes_gb2312.decode("gb2312")
> type(website_string_gb2312)
<class 'str'>
> website_string_gb2312
'http://www.169it.com/os'
>