What is wrong with below python inheritance code?


 
Thread Tools Search this Thread
Top Forums Programming What is wrong with below python inheritance code?
# 1  
Old 07-23-2018
What is wrong with below python inheritance code?

I am using python 3.4. Below is the exception I am getting-

Code:
Traceback (most recent call last):
  File "./oop.py", line 20, in <module>
    y = DerivedClass("Manu")
  File "./oop.py", line 15, in __init__
    super().__init__(self,value)
TypeError: __init__() takes 2 positional arguments but 3 were given

Code:
class Test:
    class_var = 100   # class attribute
    x = "Anu"            # class attributes

    def __init__(self,value):
        self.value = value

    def normal_function(self):
        return self.value

class DerivedClass(Test):
    def __init__(self,value):
        super().__init__(self,value)    #inheriting base class constructor
        print(self.value*2)

if __name__ == "__main__":
    test_obj = Test("Priya")

# 2  
Old 07-23-2018
Hi,

You must not give self in super().__init__(self,value).

So super().__init__(value).
This User Gave Thanks to disedorgue For This Post:
# 3  
Old 07-25-2018
just learnt below so updating here -

Code:
super().__init__(value)  -- when using super(), no need to pass self

Test.__init__(self,value)   -- when using BaseClassName, one needs to pass self too

These 2 Users Gave Thanks to Tanu For This Post:
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Python - Function print vs return - whats wrong

All, I have a basic buzz program written in python with return function. If i change return with print,it works fine but i want to know whats wrong with return statement.Can anyone help me whats wrong with this #!/usr/bin/python def div4and6(s,e): for i in range(s,e+1): if... (5 Replies)
Discussion started by: oky
5 Replies

2. Programming

Difference in multiple inheritance and multilevel inheritance: same method name ambiguity problem

Hi, In multi-level inheritance: class A { public: void fun() { cout << "A" << endl; } }; class B : public A { public: void fun() { cout << "A" << endl; } }; class C : public B { }; int main() { C c; c.fun(); // Ans: A } (1 Reply)
Discussion started by: royalibrahim
1 Replies

3. Shell Programming and Scripting

What is wrong with my code?

Hello, all Suppose my current directory has 3 files: file_1 file_2 file_3 I wrote the following codes: awk 'BEGIN{while("ls"|getline d) {myarray++}}; END{close("ls");for (i in myarray){print i, myarray}}' /dev/null I expect the output be like: 1 file_1 2 file_2 3 file_3 ... (7 Replies)
Discussion started by: littlewenwen
7 Replies

4. Programming

Inheritance

whats the use of inheriting with access specifier as private..? Please specify the answer with a simple example... Regards -- Madhu (5 Replies)
Discussion started by: MadhuM
5 Replies

5. Shell Programming and Scripting

python: what's wrong with my subprocess.Popen

my script is #!/usr/bin/env python import datetime import subprocess import sys import os import signal from time import sleep def runForAWhile(cmd, secs=10): print("running %s" % cmd) timeout = datetime.timedelta(seconds=secs) print timeout proc = subprocess.Popen(cmd,... (0 Replies)
Discussion started by: yanglei_fage
0 Replies

6. UNIX for Dummies Questions & Answers

Question on variable inheritance & code statements

1) I have the below code in concattxnrecords.sh shell script and it is calling the genericVars.sh shell script which is mentioned as below has some code inside it which would intialize some variables in it, now my question is will this shell script would inherit those variable definitions or not... (3 Replies)
Discussion started by: Ariean
3 Replies

7. Shell Programming and Scripting

What's wrong with this code?

Trying to do a file count on files between a specific date. I entered the following command, but it's not working: find . -type f \( -newer startdate -a ! -newer enddate \) -exec "ls -l | wc -l" {} \; lil help? :D (4 Replies)
Discussion started by: bbbngowc
4 Replies

8. Shell Programming and Scripting

What is wrong with this code

I just wanted to assign the filename to a variable filename="abc" datestrng=`date +%Y%m%d` filextn="txt" "LOCAL_FILE"${i}=${filename}"_"${datestrng}"."${filextn} echo "LOCAL_FILE"${i} I get the following error on 2nd last line ksh: LOCAL_FILE1=abc_20081114.txt: not... (3 Replies)
Discussion started by: mqasim
3 Replies

9. Shell Programming and Scripting

What's wrong with this code?

Hello all, Can someone tell me why I'm getting an error in the following code: export return_code="$?" if then echo "load_shaw.sas failed." exit else echo "Trigger the next script..." # /path/to/next/script fi I get an error... (3 Replies)
Discussion started by: mmignot
3 Replies

10. UNIX for Dummies Questions & Answers

What is wrong with this code?

Hello everyone, can somebody tell me what is wrong with this code: while true do java myTime > myTime.log sleep 60 done I get the following error: ./myTime: Syntax error at line 1 : `while' is not matched. Thanks in advance! (6 Replies)
Discussion started by: Lem2003
6 Replies
Login or Register to Ask a Question