Bound method error

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  • JohanCarlstrom
    New Member
    • Mar 2008
    • 2
    #1

    Bound method error

    I get bound method error (for method isempty) when trying to run this code. I have coded python for about 2 hours so Im a little lost...
    Also, if someone could post source the code of any small program consisting of multiple classes and objects, it would surely be a great help for me.


    Code:
    Code:
    -----------------------------------------
from Queue import Queue

Q=Queue()
inp=raw_input("Skriv indata: ")
indata=inp.split(" ")
i=0
while i<len(indata):
    Q.put(indata[i])
    i=i+1

print Q.isempty

----------------------------------------

from Node import Node
class Queue:
    front=None
    back=None

    def put(self, x):
        new=Node()
        new.value=x
        if self.front is None:
            self.front=new
            self.back=new
        else:
            self.back.next=new
            self.back=new

    def get(self):
        x=self.front
        self.front=self.front.next
        return x

    def isempty(self):
        return self.front==None

-----------------------------------------------

class Node:
    value=None
    next=None
    Last edited by gits; Mar 19 '20, 02:27 PM. Reason: added code tags
    Tags: None
    • bvdet
      Recognized Expert Specialist
      • Oct 2006
      • 2851
      #2
      Originally posted by JohanCarlstrom
      I get bound method error (for method isempty) when trying to run this code. I have coded python for about 2 hours so Im a little lost...
      Also, if someone could post source the code of any small program consisting of multiple classes and objects, it would surely be a great help for me.


      Code:
      [code=Python]
      -----------------------------------------
      from Queue import Queue

      Q=Queue()
      inp=raw_input(" Skriv indata: ")
      indata=inp.spli t(" ")
      i=0
      while i<len(indata):
      Q.put(indata[i])
      i=i+1

      print Q.isempty

      ----------------------------------------

      from Node import Node
      class Queue:
      front=None
      back=None

      def put(self, x):
      new=Node()
      new.value=x
      if self.front is None:
      self.front=new
      self.back=new
      else:
      self.back.next= new
      self.back=new

      def get(self):
      x=self.front
      self.front=self .front.next
      return x

      def isempty(self):
      return self.front==Non e

      -----------------------------------------------

      class Node:
      value=None
      next=None[/code]
      I ran your code but did not receive an error. Statement print Q.isempty returned what it was supposed to:
      <bound method Queue.isempty of <__main__.Que ue instance at 0x00F84CB0>>

      Try this:
      [code=Python]
      >>> Q.isempty()
      False
      >>> [/code]

        Comment

        • JohanCarlstrom
          New Member
          • Mar 2008
          • 2
          #3
          Originally posted by bvdet
          I ran your code but did not receive an error. Statement print Q.isempty returned what it was supposed to:
          <bound method Queue.isempty of <__main__.Que ue instance at 0x00F84CB0>>

          Try this:
          [code=Python]
          >>> Q.isempty()
          False
          >>> [/code]

          Oh of course. And calling methods without () means basically nothing?

            Comment

            • bvdet
              Recognized Expert Specialist
              • Oct 2006
              • 2851
              #4
              Originally posted by JohanCarlstrom
              Oh of course. And calling methods without () means basically nothing?
              No. It returns the bound method which can be assigned to a variable.

                Comment

                • swarna98
                  New Member
                  • Mar 2020
                  • 1
                  #5
                  student marklist

                  Originally posted by bvdet
                  No. It returns the bound method which can be assigned to a variable.
                  i have occur a bound method error in grade and result.

                  Code:
                  class student:
    def getStudent(self):
        self.name = input("Name: ")
        self.Roll = int(input("Roll: "))
        
class test(student):
    
    def getMarks(self):
        print("Enter the marks of the respective subjects")
        self.literature = int(input("Literature: "))
        self.math = int(input("Math: "))
        self.biology = int(input("Biology: "))
        self.physics = int(input("Physics: "))
        self.chemistry=int(input("chemistry:"))
    def average(self):
        average = Total/500
        return average
    def Grade(self):
        if self.average >=85:
            self.Grade="S"
        elif self.average >=75:
            self.Grade="A"
        elif self.average >=65:
            self.Grade="B"
        elif self.average >=55:
            self.Grade="C"
        elif self.average >=50:
            self.Grade="D"
        else:
            self.Grade="F"
        
    def Result(self):
       if marks==5:
            self.Result="PASS"
       if marks>=3:
            self.Result="COMP"
       else:
            self.Result="FAIL"
            return Result
     
class marks(test):
    def display(self):
        print("\n\nName: ",self.name)
        print("Roll : ",self.Roll)
        print("Total Marks: ", self.literature + self.math + self.biology + self.physics + self.chemistry)
        print("Average:",self.literature + self.math + self.biology + self.physics + self.chemistry /500)
        print "Grade:",self.Grade()
        print "Result:",self.Result()
    
obj = marks()
obj.getStudent()
obj.getMarks()
obj.display()
                  Last edited by gits; Mar 19 '20, 02:26 PM. Reason: added code tags

                    Comment

                    • hussainmujtaba
                      New Member
                      • Apr 2020
                      • 13
                      #6
                      Code:
                      class student:
    def getStudent(self):
        self.name = input("Name: ")
        self.Roll = int(input("Roll: "))
 
class test(student):
 
    def getMarks(self):
        print("Enter the marks of the respective subjects")
        self.literature = int(input("Literature: "))
        self.math = int(input("Math: "))
        self.biology = int(input("Biology: "))
        self.physics = int(input("Physics: "))
        self.chemistry=int(input("chemistry:"))
    def average(self):
        Total=self.literature + self.math + self.biology + self.physics + self.chemistry
        average = Total/500
        return average
    def Grade(self):
        if self.average() >=85:
            self.Grade="S"
        elif self.average() >=75:
            self.Grade="A"
        elif self.average() >=65:
            self.Grade="B"
        elif self.average() >=55:
            self.Grade="C"
        elif self.average()>=50:
            self.Grade="D"
        else:
            self.Grade="F"
        return self.Grade
 
    def Result(self):
        marks=self.literature + self.math + self.biology + self.physics + self.chemistry
        if marks==5:
            self.Result="PASS"
        if marks>=3:
            self.Result="COMP"
        else:
            self.Result="FAIL"
        return self.Result
 
class marks(test):
    def display(self):
        print("\n\nName: ",self.name)
        print("Roll : ",self.Roll)
        print("Total Marks: ", self.literature + self.math + self.biology + self.physics + self.chemistry)
        print("Average:",self.literature + self.math + self.biology + self.physics + self.chemistry /500)
        print("Grade:",self.Grade())
        print("Result:",self.Result())
 
obj = marks()
obj.getStudent()
obj.getMarks()
obj.display()
                      This code will work fine. There were quite basic bugs in there.
                      Last edited by Rabbit; Sep 1 '20, 03:42 PM.

                        Comment

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