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30 """Package that private an array-based implementation of a stream."""
33 class ArrayStream(object):
34 """Simple class that implmements a stream interface on top of an array.
36 This is used primarily by unit test classes to mock output streams. It
37 performs a similar function to StringIO, but (a) it is write-only, and
38 (b) it can be used to retrieve each individual write(); StringIO
39 concatenates all of the writes together.
42 def __init__(self, tty=False):
47 """Implement stream.write() by appending to the stream's contents."""
48 self._contents.append(msg)
51 """Return the contents of a stream (as an array)."""
55 """Empty the stream."""
59 """Return whether the stream is empty."""
60 return (len(self._contents) == 0)
63 """Flush the stream (a no-op implemented for compatibility)."""
67 return '<ArrayStream: ' + str(self._contents) + '>'