Python

I have the error

Test Failed: Text.head is not a function.

I want to be able to have a member function that can call the attributes head and tail of the Text class in the format of

Text.head

Text.tail

without parentheses or changing the names and spelling of the attributes

class Node:

def $\_\_$init$\_\_($self$,$ char$=$None$)$:

if not isinstance$($char$,$ str$)$ or len$($char$)!=1$:

raise ValueError$("$Node must contain a single character string"$)$

self.char $=$ char

self.prev $=$ None

self.next $=$ None

class Text:

def $\_\_$init$\_\_($self$,$ initial$\_$data$=$None$)$:

self.head $=$ None

self.tail $=$ None

self.length $=0$

if initial$\_$data:

if isinstance$($initial$\_$data, str$)$:

for char in initial$\_$data:

self.append$($char$)$

elif isinstance$($initial$\_$data, Text$)$:

current $=$ initial$\_$data.head

while current:

self.append$($current$.$char$)$

current $=$ current.next

else:

raise TypeError$("$Initial data must be a string or Text object"$)$

def head$()$:

return self.head

def tail$()$:

return self.tail