float() argument must be a string or a number, not 'gurobipy.LinExpr
时间: 2023-10-24 11:07:56 浏览: 44
This error occurs when you try to pass an object of type `gurobipy.LinExpr` to the `float()` function, which is only designed to work with strings or numbers.
Here's an example of how this error can occur:
```python
import gurobipy as gp
m = gp.Model()
x = m.addVar()
y = m.addVar()
expr = x + y
result = float(expr)
```
In this example, we create a Gurobi model and add two variables `x` and `y`. We then create a linear expression `expr` that is the sum of `x` and `y`. Finally, we try to convert `expr` to a float using the `float()` function, which results in the `float() argument must be a string or a number, not 'gurobipy.LinExpr'` error.
To fix this error, you need to either convert the `gurobipy.LinExpr` object to a string or a number before passing it to `float()`, or find an alternative way to achieve the desired result.