zhenqiang polunzh

## recorder.py
# -*- coding: utf-8 -*-
'''recorder.py
Provides WAV recording functionality via two approaches:

Blocking mode (record for a set duration):
>>> rec = Recorder(channels=2)
>>> with rec.open('blocking.wav', 'wb') as recfile:
...     recfile.record(duration=5.0)

Non-blocking mode (start and stop recording):
	# -- coding: utf-8 --
	'''recorder.py
	Provides WAV recording functionality via two approaches:

	Blocking mode (record for a set duration):
	>>> rec = Recorder(channels=2)
	>>> with rec.open('blocking.wav', 'wb') as recfile:
	... recfile.record(duration=5.0)

	Non-blocking mode (start and stop recording):