In the following code, the destructors of objects referenced by the 'a' and 'b' local variables are not traced by the 'step' command of pdb.

 1 class C:
 2     def __init__(self, name):
 3         self.name = name
 4
 5     def __del__(self):
 6         print('"%s" destructor' % self.name)
 7
 8 def main():
 9     a = C('a')
10     b = C('b')
11     import pdb; pdb.set_trace()
12     a = 1
13
14 main()