How to apply the lower bound constraint in a ratio?

[Mithil15]

Hello everyone,
Is it possible to constraint the lower bound of two reactions in a ratio?

for example, the following is my script:

for i in np.arange(start = 2.5, stop = 3.5, step = 0.5):
         model.reactions.<react_1>.lower_bound/model.reactions.<react_2>.lower_bound = i/i*3

However, it shows me the error:
SyntaxError: cannot assign to operator

Is there any other way to carryout this operation?

It would be helpful for me, if I get any direction to overcome the problem.

Thank you in advance

[matthiaskoenig]

I am not completely sure what you want to achieve.
i/i*3 is always 3 for every loop iteration ?!

You can easily set one lower bound based on another bound.

r1.lb/r2.lb = value

could be written as

r1.lb = r2.lb * value

Then you would just do something like:

r1.lower_bound = -100
for i in np.arange(start = 2.5, stop = 3.5, step = 0.5):
    value = i  # here you would calculate your fraction
    r2.lower_bound = r1.lower_bound * i;

Not sure this is what you wanted to do.

[Mithil15]

Thank You Very much for the Answer, this is what I was asking for

[Midnighter]

@Mithil15 you can mark the above answer as solving your question.