SymPy：如何使`nsolve`返回一个字典，找到的解决方案

Question

我想用nsolve作为后备，以solve，并喜欢用dict = True使solve回报与发现的解决方案和相应的变量的字典。但是，nsolve似乎没有此选项。

这是我使用的是什么样的解决方法：

from sympy import * 

def nsolve(equations, variables, guesses, **flags): 
    from sympy import nsolve as originalnsolve 
    result = originalnsolve(equations, variables, guesses, **flags) 
    if "dict" in flags and flags["dict"]: 
     return [dict(zip(variables, [float(value) for value in result]))] 
    else: 
     return result 

x, y = symbols("x y") 
equations = [Eq(2*x+y, 3), Eq(y-x, 1)] 
variables = [x, y] 
guesses = [1, 1] 

print("solve with dict = True produces:\n%s\n" % solve(equations, variables, dict = True) + "The result is a dictionary, as needed\n") 
print("nsolve without dict = True produces:\n%s\n" % nsolve(equations, variables, guesses) + "nsolve doesn't return a dictionary\n") 
print("nsolve with dict = True produces:\n%s\n" % nsolve(equations, variables, guesses, dict = True) + "My workaround wrapper function returns a dictionary\n") 

输出将是：

solve with dict = True produces: 
[{x: 2/3, y: 5/3}] 
The result is a dictionary, as needed 

nsolve without dict = True produces: 
[0.666666666666667] 
[ 1.66666666666667] 
nsolve doesn't return a dictionary 

nsolve with dict = True produces: 
[{x: 0.6666666666666666, y: 1.6666666666666667}] 
My workaround wrapper function returns a dictionary 

我的问题：

• 我错过了一个简单的方法来让nsolve返回一个字典吗？

• 如果不是：我的方法有问题吗？

Answer 1

nsolve没有一个dict选项。如果您想申请一个，您应该在issue tracker或者实现它的拉取请求中打开一个功能请求。