Why += is considered as an assignment operator while >= is not?

Question

I was thinking why the '=' in '+=' is considered as assignment while '=' in '>=' is not considered as such. There is no importance behind this question but some random thought of a beginner. For example purpose, you can consider that

a = np.array([1,2,3,4,5])
a += 2 # array updated and assigned to a

a>=2 # becomes a boolean indexing filter

Answer 1

a += 2 changes the value of a. It reassigns it's value to be two more than it was before. By the way, += as a whole is the assignment operator, not just the =.

a>=2 does not change the value of a. Yes, it becomes true or false. But 'true' or 'false' is all it is. It does not get assigned to anything. The value of a is as it was before.

You can do b = a>=2. But in that case, = is the assignment operator because it is what assigns the value to b.