Sympy不起作用

Question

当我运行此代码时：

from sympy import *
x = symbols('x')
equation = "x + 2"
var = solve(Eq(equation, 5), x)
print(var)

我遇到了一个大错误。

请帮助

Answer 1

尝试

from sympy import *
x = Symbol('x')
equation = x + 2 
var = solve(Eq(equation, 5), x)
print(var)

我在计算机上得到[3]的结果。您的也应该工作！

Answer 2

安装软件包：

 sudo pip install sympy

解决方案

from sympy import *
x = symbols('x')
equation = x + 2
var = solve(Eq(equation, 5), x)
print(var)

输出：[3]

Answer 3

请勿将方程式用引号引起来。 工作示例：

from sympy import *
x = Symbol('x')
equation = Eq(x+2, 5)
answer = solve(equation,x)
print(answer)

输出[3]

Answer 4

如果要使用字符集，这是另一种解决方案。

from sympy import *
x = Symbol('x')
equation = 'x + 2'
sympy_eq = sympify("Eq(" + equation + ",5)")
var = solveset(sympy_eq,x)
print(var)