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I added the following two lines and I was able to run the code.
Before: 
 line = fp.readline()
 if self.debugging > 2: print('*retr*', repr(line))
 if not line:
 break
 if line[-2:] == CRLF:
 line = line[:-2]
 elif line[-1:] == '\n':
 line = line[:-1]
 callback(line)
After: 
 line = fp.readline()
 if self.debugging > 2: print('*retr*', repr(line))
 if not line:
 break
 if line == '':
 break
 if line[-2:] == CRLF:
 line = line[:-2]
 elif line[-1:] == '\n':
 line = line[:-1]
 callback(line)
As a patch:
426,427d425
< if line == '':
< break
What else do I need to do?