[Python-3000] TypeError: expected bytes, str found

[Vizcayno]

I am doing some testing using Python r30a3:61161 under command prompt
of WinXp SP2.
Is this possible to find an explanation about next error? I tried to
find the error message in the web but no info exists and, can not
isolate or reproduce it.
Many, many thanks for your attention.

Traceback (most recent call last):
  File "testconn.py", line 112, in <module>
    main(sys.argv)
  File "testconn.py", line 100, in main
    sap.sapinfo()
  File "C:\os\sapconn\saprfc_py30\saprfc.py", line 142, in sapinfo
    print("Aqui estoy")
  File "C:\python30\lib\io.py", line 1248, in write
    self.buffer.write(b)
  File "C:\python30\lib\io.py", line 852, in write
    if len(self._write_buf) > self.buffer_size:
TypeError: expected bytes, str found