lmfit/lmfit-py — pull request #134 by licode (2014-09-13 22:04:56+00:00)
Title: Create a new object for model summation

I am using lmfit these days, and find that when we do

composite_model2 = composite_model1+single_model

the composite_model1 will also be updated. I feel that it is better not to change composite_model1, because we may need to use it later.

This PR resolves the issue, and I can send a test later.