TypeError: add() takes exactly 2 positional arguments (3 given)

Question

Why I am getting this error Can anyone tell please or explain me how to use it using simple example

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
/tmp/ipykernel_33/3577035061.py in <module>
      6 # Matcher class object
      7 matcher = Matcher(nlp.vocab)
----> 8 matcher.add("matching_1", None, pattern)
      9 
     10 matches = matcher(doc)

/opt/conda/lib/python3.7/site-packages/spacy/matcher/matcher.pyx in spacy.matcher.matcher.Matcher.add()

TypeError: add() takes exactly 2 positional arguments (3 given)

In Below link https://spacy.io/api/matcher

Answer 1

What are you passing the None for? It looks like you just need:

matcher.add("matching_1", pattern)

You are getting the error because the function takes 2 unnamed arguments but you are trying to pass 3. If you want to pass a callback function as well you would need to write:

matcher.add("matching_1", pattern, on_match = my_callback_function)

Answer 2

The new version of spacy needs square brackets around pattern. Also, callback became an optional term.

Therefore in your case you just need:

from spacy.matcher import Matcher

matcher = Matcher(nlp.vocab)
matcher.add("matching_1", [pattern])
matches = matcher(doc)

Answer 3

This works for me If you anyother answer feel free to answer

# load spaCy model
nlp = spacy.load("en_core_web_sm")
text = "GDP in developing countries such as Vietnam will continue growing at a high rate." 

# create a spaCy object 
doc = nlp(text)

#define the pattern 
pattern = [[{'POS':'NOUN'}, 
           {'LOWER': 'such'}, 
           {'LOWER': 'as'}, 
           {'POS': 'PROPN'}] ]#proper noun
# Matcher class object 
matcher = Matcher(nlp.vocab) 
matcher.add("matching_1",patterns=pattern) 

matches = matcher(doc) 
span = doc[matches[0][1]:matches[0][2]] 

print(span.text)

Answer 4

matcher.add("matching_1", [pattern])

This worked for me