Better method for python3 compatibility #80
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https://docs.python.org/2.7/library/subprocess.html#subprocess.Popen.communicate
https://docs.python.org/3.8/library/subprocess.html#subprocess.Popen.communicate
The universal_newlines argument is equivalent to text and is provided for backwards compatibility. By default, file objects are opened in binary mode.
This fixes the
TypeError: can only concatenate str (not "bytes") to str
(for error_string = cmd[0] + '\r' + err)
and also the
TypeError: write() argument must be str, not bytes
(for fsym.write(out))