AttributeError can t set attribute in python

Question

Here is my code  N   namedtuple  N     ind    set    v    def solve       items        stack        R   set range 0 8       for i in range 0 8           items append N i R 8                 stack append N 0 R-set range 0 1   i       while len stack  gt 0            node   stack pop           print node         print items node ind             items node ind  v   node v   In the last line I cant set the items node ind  v value to node v as I want  and am getting the error    AttributeError  can t set attribute    I don t know what s wrong but it must be something based on syntax as using statements like node v  1 is also showing same error  I m new to Python  so please suggest a way to make the above change possible

User · Answer

For those searching this error  another thing that can trigger AtributeError  can t set attribute is if you try to set a decorated  property that has no setter method  Not the problem in the OP s question  but I m putting it here to help any searching for the error message directly   if you don t like it  go edit the question s title    class Test      def   init   self           self  attr    quot original value quot            This will trigger an error            self attr    quot new value quot       property     def attr self           return self  attr  Test

User · Answer

items node ind    items node ind   replace v node v     Note  Don t be discouraged to use this solution because of the leading underscore in the function  replace  Specifically for namedtuple some functions have leading underscore which is not for indicating they are meant to be  private

User · Answer

namedtuples are immutable  just like standard tuples  You have two choices    Use a different data structure  e g  a class  or just a dictionary   or Instead of updating the structure  replace it    The former would look like   class N object        def   init   self  ind  set  v           self ind   ind         self set   set         self v   v   And the latter   item   items node ind  items node ind    N item ind  item set  node v    Edit  if you want the latter  Ignacio s answer does the same thing more neatly using baked-in functionality

[python] AttributeError: can't set attribute in python

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