PythonWin: Strange Debugger Behavior

[Charles Medcoff]

The script below exhibits inconsistent behavior under the PythonWin
Debugger.  The first time I step through it  runs until an exception happens
on the line "   self._key = RegOpenKeyEx(self._hive, subkey)" (because of a
missing key from the registry on my machine?).  If I restart the debugging
process I observe a difference behavior.  The call to RegKey.__init__(...)
is immediatlely followed by a call to RegKey.__del__().  The happens before
the print statement (the line following the constructor call) and perhaps
even before the assignment.  The call to __del__() also throws an exception
(because the attiribute _key has not yet been created?).  Comments.



from win32con import HKEY_CURRENT_USER
from win32con import HKEY_LOCAL_MACHINE
from win32api import RegOpenKeyEx
from win32api import RegQueryValueEx
from win32api import RegQueryInfoKey
from win32api import RegEnumKey
from win32api import RegEnumValue

#######################################################################
# classes
#######################################################################
class RegKey:
    HKEY_CURRENT_USER = 0x80000001
    HKEY_LOCAL_MACHINE = 0x80000002
    def __init__(self, hive):
        _hive = hive
    def open(self, subkey):
        self._subkey = subkey
        self._key = RegOpenKeyEx(self._hive, subkey)
    def value(self, val):
        self._val = RegQueryValueEx(self._key, path)
        return self._val[0]
    def __del__(self):
        self._key.Close()


#######################################################################
# main - for testing
#######################################################################

if __name__ == '__main__':
    testkey = RegKey(RegKey.HKEY_LOCAL_MACHINE)
    print testkey
    testkey.open('SOFTWARE\Microsoft\DrWatson')
    print testkey.value('ProductDir')