python - AttributeError: NoneType object has no attribute -


i, python novice, following error message when executing code have received author:

line 412, in add_family     mother_birth_ref = mother.get_birth_ref() attributeerror: 'nonetype' object has no attribute 'get_birth_ref'

the relevant part of code must 1 here:

def write_child_stats(self):     file = open("%s/intern/child-stats.txt" % self.dir_name, 'w')  def add_family(family, marriage_event, divorce_event):     father_handle = family.get_father_handle()     mother_handle = family.get_mother_handle()      father = self.database.get_person_from_handle(father_handle)     father_birth_ref = father.get_birth_ref()     father_birth = none     if father_birth_ref:         father_birth = self.database.get_event_from_handle(father_birth_ref.ref)      mother = self.database.get_person_from_handle(mother_handle)     mother_birth_ref = mother.get_birth_ref()     mother_birth = none     if mother_birth_ref:         mother_birth = self.database.get_event_from_handle(mother_birth_ref.ref)      children = []     child_refs = family.get_child_ref_list()     child_handle in child_refs:         child = self.database.get_person_from_handle(child_handle.ref)         if child:             child_birth_ref = child.get_birth_ref()             if child_birth_ref:                 child_birth = self.database.get_event_from_handle(child_birth_ref.ref)                 children.append("%04d-%02d-%02d" % child_birth.get_date_object().get_ymd())

how can fix issue?

 mother = self.database.get_person_from_handle(mother_handle)

this line returning none. check get_person_from_handle function.

alternatively, can add check :

mother = self.database.get_person_from_handle(mother_handle) mother_birth_ref = none mother_birth = none if mother:     mother_birth_ref = mother.get_birth_ref() if mother_birth_ref:     mother_birth = self.database.get_event_from_handle(mother_birth_ref.ref)

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