Attribute Error in class attribute

Question

I have written a class called cl:

class cl :
def __int__(self):
    self.a = 0


def increment(self):
    self.a +=1

def print_a(self):
    print ("value : "+str(self.a))

I have written another class called test. However, I got an error when calling methods.

 from cl import *

class test :
    def __int__(self):
        self.b = 0
        self.c = cl()


def main(self):
    self.c.increment()
    self.c.print_a()
    self.c.increment()
    self.c.print_a()

d = test()
d.main()

What I got is this:

 Traceback (most recent call last):
  File "test_file.py", line 19, in <module>

    d.main()
  File "test_file.py", line 12, in main
    self.c.increment()
AttributeError: test instance has no attribute 'c'

Can anyone explain why that happens and what is the issue with my code? I am a high school student. Can you explain to me? And can you help me to fix this?

score 3 · Accepted Answer · edited May 23 '17 at 12:01

3

You're misspelling __init__ with __int__:

class cl :
    def __int__(self):
        self.a = 0

Should be

class cl :
    def __init__(self):
        self.a = 0

Note that encompassing a main method inside of the test class is really an anti-pattern in Python; the form of

def main():
    ...

if __name__ == "__main__":
    main()

is preferred and is more Pythonic.

For some reference on the if __name__ == "__main__" pattern, see:

edited May 23 '17 at 12:01

Community

1
1

answered Dec 10 '16 at 05:07

Rushy Panchal

16,979
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61
94

Thank you sir for your kind help, can you little bit explain the mechanism or can you give me a link to refer ? – etution lanka Dec 10 '16 at 05:09

score 1 · Answer 2 · answered Dec 10 '16 at 05:45

1

main function does not belong the class test , it belongs the test.py which your test class in, so the self in main is test.py , not test

answered Dec 10 '16 at 05:45

freeeze king

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Attribute Error in class attribute

2 Answers2