'Return data from html file with variable

I have a python file like this :

data = "data is there"
with open('index.html', 'r+') as f:
  index = f.read()
  return index

My index.html is like this :

<html>'+data+'</html>

Actual Output

<html>'+data+'</html>

Wanted output

<html>data is there</html>

EDIT: As specified in the comment, this answers my question : light weight template engine for python

python

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