Menu
def Ancestors (otu,tree):
if tree[otu][0][0] == None:
return []
else:
return [otu,tree[otu][0][0]] + Ancestors (tree[otu][0][0],tree)
The problem essentially is that at some point, the function tries to call a something which is None, this happens instead of the function returning the list that I want. I thought the if statement had accounted for that, but it would seem I was wrong. Any advice?
Traceback (most recent call last):
File "<pyshell#41>", line 1, in <module>
Ancestors('A',a)
File "C:\x.py", line 129, in Ancestors
return [otu,tree[otu][0][0]] + Ancestors (tree[otu][0][0],tree)
File "C:\x.py", line 129, in Ancestors
return [otu,tree[otu][0][0]] + Ancestors (tree[otu][0][0],tree)
File "C:\x.py", line 129, in Ancestors
return [otu,tree[otu][0][0]] + Ancestors (tree[otu][0][0],tree)
File "C:\x.py", line 129, in Ancestors
return [otu,tree[otu][0][0]] + Ancestors (tree[otu][0][0],tree)
File "C:\x.py", line 126, in Ancestors
if tree[otu][0][0] == None:
TypeError: 'NoneType' object is not subscriptable
This is what tree is
{'A': [('AD', 4.0), None, None], 'C': [('ADBFGC', 14.5), None, None], 'B': [('BF', 0.5), None, None], 'E': [('ADBFGCE', 17.0), None, None], 'D': [('AD', 4.0), None, None], 'G': [('BFG', 6.25), None, None], 'F': [('BF', 0.5), None, None], 'ADBFG': [('ADBFGC', 6.25), ('AD', 4.25), ('BFG', 2.0)], 'BF': [('BFG', 5.75), ('B', 0.5), ('F', 0.5)], 'ADBFGC': [('ADBFGCE', 2.5), ('ADBFG', 6.25), ('C', 14.5)], 'ADBFGCE': [None, ('ADBFGC', 2.5), ('E', 17.0)], 'BFG': [('ADBFG', 2.0), ('BF', 5.75), ('G', 6.25)], 'AD': [('ADBFG', 4.25), ('A', 4.0), ('D', 4.0)]}
with otu referring to any of the strings in the tree.
487
The error “TypeError: 'function' object is not subscriptable” occurs when you try to access an item from a function. Functions cannot be indexed using square brackets. To solve this error, ensure functions have different names to variables. Always call a function before attempting to access the functions.
The TypeError: Nonetype object is not subscriptable is an error that occurs when you try to subscript an object that has a none value.
The error “TypeError: 'NoneType' object is not iterable” occurs when you try to iterate over a NoneType object. Objects like list, tuple, and string are iterables, but not None. To solve this error, ensure you assign any values you want to iterate over to an iterable object.
There are few objects like list, dict , tuple are iterable in python. But the error “ Typeerror nonetype object is not subscriptable” occurs when they have None values and Python code access them via index or subscript. Firstly, Let’s understand with some code examples. Let’s run and see its output.
This error occurs when you try to subscript an object having “none” value. In the above example we are trying to print the value of “NoneType” object at index [0]. If we print the data type of "mylist" variable, it returns 'NoneType' variable.
If you subscript any object with None value, Python will raise TypeError: ‘NoneType’ object is not subscriptable exception. The term subscript means retrieving the values using indexing.
In Python, the objects that implement the __getitem__ method are called subscriptable objects. For example, lists, dictionaries, tuples are all subscriptable objects.
This simply means that either tree, tree[otu], or tree[otu][0] evaluates to None, and as such is not subscriptable. Most likely tree[otu] or tree[otu][0]. Track it down with some simple debugging like this:
def Ancestors (otu,tree):
try:
tree[otu][0][0]
except TypeError:
print otu, tre[otu]
raise
#etc...
or pdb
178
One of the values you pass on to Ancestors becomes None at some point, it says, so check if otu, tree, tree[otu] or tree[otu][0] are None in the beginning of the function instead of only checking tree[otu][0][0] == None. But perhaps you should reconsider your path of action and the datatype in question to see if you could improve the structure somewhat.
44
What is a when you call Ancestors('A',a)? If a['A'] is None, or if a['A'][0] is None, you'd receive that exception.
1
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
