Python Learning Notes (24) Stringio and Bytesio

Stringio

Most of the time, data read and write is not necessarily a file, but also can read and write in memory .

Stringio, as the name implies, reads and writes STR in memory.

To write Str to Stringio, we need to create a stringio and then write it like a file:

  >>> from  io import   Stringio  >>> f = >>> f.write ( hello   " )  5>>> F.write ( '   '  )  1>>> F.write ( Span style= "color: #800000;" > '  

getvalue()method is used to obtain the post-write Str.

To read Stringio, you can initialize the Stringio with a STR and then read it like a read file:

 from Import Stringio>>> f = Stringio ('hello!\nhi!\ngoodbye! ' ) while True     : ... = F.readline ()      ... if "' :...           Break ...      Print (S.strip ()) ... Hello! Hi! goodbye!

Bytesio

Stringio operation can only be str, if you want to manipulate binary data , you need to use Bytesio.

Bytesio implements read-write bytes in memory, we create a bytesio and then write some bytes:

 from Import Bytesio>>> f = Bytesio ()>>> f.write (' Chinese '. Encode ( ' Utf-8 ' )print(F.getvalue ()) b'\xe4\xb8\xad\xe6\x96\x87' 

Note that the write is not str, but the UTF-8 encoded bytes.

Similar to Stringio, you can initialize the Bytesio with a bytes, and then read like a read file :

 from Import Bytesio>>> f = bytesio (b'\xe4\xb8\xad\xe6\x96\x87')> >> f.read () b'\xe4\xb8\xad\xe6\x96\x87'

Summary

Stringio and Bytesio are methods of operating str and bytes in memory, allowing for a consistent interface to read and write files.

Python Learning Notes (24) Stringio and Bytesio