按字母顺序排列集合(Sorting a collection in alphabetical order)

 包含您实际运行的代码，得到的结果以及您的预期结果总是一个好主意。 
 
 在这里，主要的问题是你有一个语法错误。 其次，你应该使用numpy数组，而不是列表。 第三，正如文档所示（请参阅https://lmfit.github.io/lmfit-py/model.html#lmfit.model.ModelResult.eval ） result.eval()将params作为第一个参数，而不是自变量。 总之，你想用你的最后两行代替 
 
x1 = np.array([1, 2, 3]) # input for prediction
a = result.eval(x=x1)   # prediction
 
 应该按预期工作。 
 
 而且：当然，你不需要lmfit做线性回归。 ）。 

It is always a good idea to include the code you actually ran, the result you got, and the result you expected. 
 
Here, the main problem is that you have a syntax error. Second, you should use numpy arrays, not lists. And third, as the docs show (see https://lmfit.github.io/lmfit-py/model.html#lmfit.model.ModelResult.eval) result.eval() would take params as the first argument, not the independent variable. In short, you want to replace your last two lines with
 
x1 = np.array([1, 2, 3]) # input for prediction
a = result.eval(x=x1)   # prediction
 
that should work as expected.
 
And: of course, you don't need lmfit to do a linear regression. ;).