The output now is

c:\Users\Mark\PythonIssues>cgitbbug.py getattr1
3.4.1 (v3.4.1:c0e311e010fc, May 18 2014, 10:38:22) [MSC v.1600 32 bit (Intel)]
Traceback (most recent call last):
  File "C:\Users\Mark\PythonIssues\cgitbbug.py", line 34, in <module>
    d.h('aaa')
  File "C:\Users\Mark\PythonIssues\cgitbbug.py", line 23, in _f
    raiseError()
  File "C:\Users\Mark\PythonIssues\cgitbbug.py", line 3, in raiseError
    raise ValueError('original error')
ValueError: original error

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\Mark\PythonIssues\cgitbbug.py", line 36, in <module>
    print(cgitb.html(sys.exc_info(),context=3))
  File "c:\python34\lib\cgitb.py", line 136, in html
    vars = scanvars(reader, frame, locals)
  File "c:\python34\lib\cgitb.py", line 88, in scanvars
    value = getattr(parent, token, __UNDEF__)
  File "C:\Users\Mark\PythonIssues\cgitbbug.py", line 16, in __getattr__
    if self._mad=='getattr1': raise ValueError('getattr1 madness')
ValueError: getattr1 madness

Thus the madness has been fixed and this can be closed as "out of date".