Finding all paths from root to one specific leaf
I am trying to print all possible paths to get from the root a specific leaf. Each path needs to be represented by a list of "True" - if I went the positive option and "False" - if i went the negative way. The leaves of the tree are illnesses and each other node is a symptom. I am trying to do it by running with one list which holds the path and a second list which holds all possible paths if there is more than one. I keep getting an error :"AttributeError: 'NoneType' object has no attribute 'data'"
my code is divided into a main function and a helper function. Diagnoser is the class im working in.
def paths_to_illness(self, illness):
temp_lst =
final_lst =
self.path_helper(illness, temp_lst, final_lst)
return final_lst
def path_helper(self, illness, path_lst, total_paths_lst):
if illness == self.root.data and (not self.root.positive_child or
not self.root.negative_child):
total_paths_lst.append(path_lst)
path_lst.pop()
return
if not self.root.negative_child or not self.root.positive_child:
path_lst.pop()
if self.root.negative_child:
path_lst.append(False)
neg = Diagnoser(self.root.negative_child)
neg.path_helper(illness, path_lst, total_paths_lst)
else:
path_lst.append(True)
pos = Diagnoser(self.root.positive_child)
pos.path_helper(illness, path_lst, total_paths_lst)
thanks for the help.
python-3.x recursion tree
asked Dec 31 '18 at 15:05
Shulik KachkoShulik Kachko
11
add a comment |
I am trying to print all possible paths to get from the root a specific leaf. Each path needs to be represented by a list of "True" - if I went the positive option and "False" - if i went the negative way. The leaves of the tree are illnesses and each other node is a symptom. I am trying to do it by running with one list which holds the path and a second list which holds all possible paths if there is more than one. I keep getting an error :"AttributeError: 'NoneType' object has no attribute 'data'"
my code is divided into a main function and a helper function. Diagnoser is the class im working in.
def paths_to_illness(self, illness):
temp_lst =
final_lst =
self.path_helper(illness, temp_lst, final_lst)
return final_lst
def path_helper(self, illness, path_lst, total_paths_lst):
if illness == self.root.data and (not self.root.positive_child or
not self.root.negative_child):
total_paths_lst.append(path_lst)
path_lst.pop()
return
if not self.root.negative_child or not self.root.positive_child:
path_lst.pop()
if self.root.negative_child:
path_lst.append(False)
neg = Diagnoser(self.root.negative_child)
neg.path_helper(illness, path_lst, total_paths_lst)
else:
path_lst.append(True)
pos = Diagnoser(self.root.positive_child)
pos.path_helper(illness, path_lst, total_paths_lst)
thanks for the help.
python-3.x recursion tree
asked Dec 31 '18 at 15:05
Shulik KachkoShulik Kachko
11
Can you add all theDiagnoserclass? does he hasrootattribute? who init it?
– dWinder
Dec 31 '18 at 15:34
add a comment |
I am trying to print all possible paths to get from the root a specific leaf. Each path needs to be represented by a list of "True" - if I went the positive option and "False" - if i went the negative way. The leaves of the tree are illnesses and each other node is a symptom. I am trying to do it by running with one list which holds the path and a second list which holds all possible paths if there is more than one. I keep getting an error :"AttributeError: 'NoneType' object has no attribute 'data'"
my code is divided into a main function and a helper function. Diagnoser is the class im working in.
def paths_to_illness(self, illness):
temp_lst =
final_lst =
self.path_helper(illness, temp_lst, final_lst)
return final_lst
def path_helper(self, illness, path_lst, total_paths_lst):
if illness == self.root.data and (not self.root.positive_child or
not self.root.negative_child):
total_paths_lst.append(path_lst)
path_lst.pop()
return
if not self.root.negative_child or not self.root.positive_child:
path_lst.pop()
if self.root.negative_child:
path_lst.append(False)
neg = Diagnoser(self.root.negative_child)
neg.path_helper(illness, path_lst, total_paths_lst)
else:
path_lst.append(True)
pos = Diagnoser(self.root.positive_child)
pos.path_helper(illness, path_lst, total_paths_lst)
thanks for the help.
python-3.x recursion tree
asked Dec 31 '18 at 15:05
Shulik KachkoShulik Kachko
11
I am trying to print all possible paths to get from the root a specific leaf. Each path needs to be represented by a list of "True" - if I went the positive option and "False" - if i went the negative way. The leaves of the tree are illnesses and each other node is a symptom. I am trying to do it by running with one list which holds the path and a second list which holds all possible paths if there is more than one. I keep getting an error :"AttributeError: 'NoneType' object has no attribute 'data'"
my code is divided into a main function and a helper function. Diagnoser is the class im working in.
def paths_to_illness(self, illness):
temp_lst =
final_lst =
self.path_helper(illness, temp_lst, final_lst)
return final_lst
def path_helper(self, illness, path_lst, total_paths_lst):
if illness == self.root.data and (not self.root.positive_child or
not self.root.negative_child):
total_paths_lst.append(path_lst)
path_lst.pop()
return
if not self.root.negative_child or not self.root.positive_child:
path_lst.pop()
if self.root.negative_child:
path_lst.append(False)
neg = Diagnoser(self.root.negative_child)
neg.path_helper(illness, path_lst, total_paths_lst)
else:
path_lst.append(True)
pos = Diagnoser(self.root.positive_child)
pos.path_helper(illness, path_lst, total_paths_lst)
thanks for the help.
python-3.x recursion tree
python-3.x recursion tree
asked Dec 31 '18 at 15:05
Shulik KachkoShulik Kachko
11
asked Dec 31 '18 at 15:05
Shulik KachkoShulik Kachko
11
asked Dec 31 '18 at 15:05
Shulik KachkoShulik Kachko
11
asked Dec 31 '18 at 15:05
Shulik KachkoShulik Kachko
11
asked Dec 31 '18 at 15:05
Shulik KachkoShulik Kachko
11
11
Can you add all theDiagnoserclass? does he hasrootattribute? who init it?
– dWinder
Dec 31 '18 at 15:34
add a comment |
Can you add all theDiagnoserclass? does he hasrootattribute? who init it?
– dWinder
Dec 31 '18 at 15:34
Can you add all the
Diagnoser class? does he has root attribute? who init it?– dWinder
Dec 31 '18 at 15:34
Can you add all the
Diagnoser class? does he has root attribute? who init it?– dWinder
Dec 31 '18 at 15:34
add a comment |
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Can you add all the
Diagnoserclass? does he hasrootattribute? who init it?– dWinder
Dec 31 '18 at 15:34