SymPy：如何使`nsolve`返回一個字典，找到的解決方案

Question

我想用nsolve作爲後備，以solve，並喜歡用dict = True使solve回報與發現的解決方案和相應的變量的字典。但是，nsolve似乎沒有此選項。

這是我使用的是什麼樣的解決方法：

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") 

輸出將是：

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 

我的問題：

• 我錯過了一個簡單的方法來讓nsolve返回一個字典嗎？

• 如果不是：我的方法有問題嗎？

Answer 1

nsolve沒有一個dict選項。如果您想申請一個，您應該在issue tracker或者實現它的拉取請求中打開一個功能請求。