similarity of string in python sentence code example

Example 1: check string similarity python

from difflib import SequenceMatcher

def similar(a, b):
    return SequenceMatcher(None, a, b).ratio()

>>> similar("Apple","Appel")
0.8
>>> similar("Apple","Mango")
0.0

Example 2: sentence similarity python

# sentence_transformer: Python module using Sentence BERT 
# check documentation in source link for further details
from sentence_transformers import SentenceTransformer
from sentence_transformers.util import pytorch_cos_sim # cosine silarity

# stsb-roberta-large is one of the possible pre-trained models
model = SentenceTransformer('stsb-roberta-large')

# list of sentences (type: str)
sentences = list(...) 

# calculate the embeddings
embeddings = bert_model.encode(sentences)

# example: cosine similarity among first and second sentences
cos_similarity = pytorch_cos_sim(embeddings[0], embeddings[1])