Use readline on the input fd instead of iterating #5
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In Python 2.x, using 'for line in self.fd' causes messages to be delayed and arrive in bursts due to internal read-ahead buffering, see http://bugs.python.org/issue3907 Using readline() explicitly avoids this problem as it doesn't read ahead.
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In Python 2.x, using 'for line in self.fd' causes messages to be delayed and arrive in bursts due to internal read-ahead buffering, see http://bugs.python.org/issue3907 and http://stackoverflow.com/questions/2804543/read-subprocess-stdout-line-by-line
Using readline() explicitly avoids this problem as it doesn't read ahead.