Why not have a recvall method?

[陶青云]

Hello, all  
The socket object has a `sendall` method that can send all bytes you specified. 
 
Oppositely, socket only has a recv method. I wonder why there is not a 
`recvall` method?  
To workaround this, I use `f = socket.makefile('rb')`, then all `f.read(n)` 
Thanks.
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