Python求解三元一次方程

以下是一个用Python求解三元一次方程的例子：

import sympy as sp

# 输入三元一次方程
equations = []
for i in range(3):
    equation = input("请输入第%d个三元一次方程：" % (i + 1))
    equations.append(equation)

# 提取方程中的系数和常数项
coefficients = []
constants = []
for equation in equations:
    equation_parts = equation.split("=")
    equation_left = equation_parts[0].strip()
    equation_right = equation_parts[1].strip()
    equation_left_terms = equation_left.split("+")
    equation_right_terms = equation_right.split("+")
    equation_terms = equation_left_terms + equation_right_terms
    equation_coefficients = []
    equation_constants = []
    for term in equation_terms:
        if term.endswith("x") or term.endswith("y") or term.endswith("z"):
            coefficient = term[:-1].strip()
            equation_coefficients.append(coefficient)
        else:
            constant = term.strip()
            equation_constants.append(constant)
    coefficients.append(equation_coefficients)
    constants.append(equation_constants)

# 构建符号变量
x, y, z = sp.symbols('x y z')

# 构建方程组
equations = []
for i in range(3):
    equation = sp.Eq(coefficients[i][0]*x + coefficients[i][1]*y + coefficients[i][2]*z, constants[i][0])
    equations.append(equation)

# 解方程组
solution = sp.solve(equations, (x, y, z))

# 输出解
print("方程的解为：")
for variable, value in solution.items():
    print(variable, "=", value)