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While using the pty.py module I had cause to want to be able to silently eat characters from the input stream. I discovered that because of the check for end of file being "if not data" that there was no way to do this.
Since the default function used by spawn and _copy is a thin wrapper on os.read, I figured that it would be useful to interpret None as a sentinel value meaning "this is not EOF, but there's nothing I actually want to copy over."