I think the problem you have is that the code assigning choices is
only run the first time the class is loaded, unlike php where it would
be read and loaded at each request, it only gets loaded once here. To
get around this you need to move your dynamic code to the forms
__init__ method so it runs each time an _instance_ is created rather
than only once when the _class_ is created (the first time mod_python
loads the file).
Something like this (not tested, but might be close)
class CancelForm(forms.Form):
name = forms.CharField(label="name", max_length=10)
no = forms.CharField(label="personalid", max_length=10)
unit = forms.ChoiceField(label="unitname", choices=[])
def __init__(self,*args,*kwargs): # This will get run every time a
form _instance_ is created
super(CancelForm, self).__init__(*args, **kwargs) # This calls
the normal init which creates self.fields, etc
self.fields['unit'].widget.choices = [('', '------------')] +
[(unit.id, unit.name) for unit in Sign2.objects.all()] #override the
empty choices
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