Type Error - stem() missing 1 required positional argument : 'word'

Question

I am working on a script to extract relevant tags from the text file which i converted from a URL. One part of the script is giving me error when i apply stemmer, the code is as below

def __call__(self, tag):
    '''
    @param tag: the tag to be stemmed

    @returns: the stemmed tag
    '''

    string = self.preprocess(tag.string)
    tag.stem = self.stemmer.stem(string)
    return tag 

the error is as below

Type Error - stem() missing 1 required positional argument : 'word'

the line causing the error is

tag.stem = self.stemmer.stem(string)

I am using Python, if anyone can help me to modify the code to get rid of the error please.

Answer 1

I think you didn't instantiate self.stemmer,ie

class stemmer(object):
    def stem(self, word):
        print('stem')

obj = stemmer 
obj.stem("word")

this will cause same error,beacause Class won't pass self argument to method,so you need instantiate the stemmer

obj = stemmer()
obj.stem("word")