Why not have a recvall method?

[陶青云]

Hello, allThe 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 `call f.read(n)`
Thanks.
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