Return True False and None in Python

Question

I have function a call function b  returns True or False to a   afterwards function a can return the result to be printed   class C               def a self  data            p   self head         return self b  p data       def b self  p  data            current   p         if current data    data              return True         else              return False   if   name       main            x   C       print x a 1     Sometimes it returns None eventhough it is intended to be True  I m not sure what happened

User · Accepted Answer

It s impossible to say without seeing your actual code   Likely the reason is a code path through your function that doesn t execute a return statement   When the code goes down that path  the function ends with no value returned  and so returns None   Updated   It sounds like your code looks like this   def b self  p  data        current   p      if current data    data           return True      elif current data    1          return False      else           self b current next  data    That else clause is your None path   You need to return the value that the recursive call returns       else          return self b current next  data    BTW  using recursion for iterative programs like this is not a good idea in Python   Use iteration instead   Also  you have no clear termination condition

[python] Return True, False and None in Python

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