#183 Missing import for flush() on windows

[Antoine Calando]

flush() is broken in serialwin32.py because module time is not imported.

The sleep call is usueally skipped, as writeTimeout is None by default, but when writeTimeout is 0 the problem occurs.

Workaround: replace the flush function in your own code:

def flush_workaround(self):
    import time
    while self.outWaiting():
       time.sleep(0.05)

# Fix broken pyserial
Serial.flush = flush_workaround

[Chris Liechti]

fix comitted to https://github.com/pyserial/pyserial