关于python的问题，如何解决？

Question

八成是写的代码不对，怎么改才能不报错啊

from sympy import symbols，solve

x=symbols（'x')
y=symbols('y')
z=symbols('z')
12≥3x+4y+2y
print(solve(x,y,z>0)
from sympy import symbols，solve

x=symbols（'x')
y=symbols('y')
z=symbols('z')
12≥3x+4y+2y
print(solve(x,y,z>0)

//头一次搞出了黑色背景的代码，爷青结www

Answer 1

这里用回溯法，就是嵌套循环呗

result=[]
for x1 in range(5):
    for x2 in range(4):
        for x3 in range(7):
            if 3*x1+4*x2+2*x3<=12:
                result.append((x1,x2,x3))
print(result)

结果：

[(0, 0, 0), (0, 0, 1), (0, 0, 2), (0, 0, 3), (0, 0, 4), (0, 0, 5), (0, 0, 6), (0, 1, 0), (0, 1, 1), (0, 1, 2), (0, 1, 3), (0, 1, 4), (0, 2, 0), (0, 2, 1), (0, 2, 2), 
(0, 3, 0), (1, 0, 0), (1, 0, 1), (1, 0, 2), (1, 0, 3), (1, 0, 4), (1, 1, 0), (1, 1, 1), (1, 1, 2), (1, 2, 0), (2, 0, 0), (2, 0, 1), (2, 0, 2), (2, 0, 3), (2, 1, 0), (2, 1, 1), (3, 0, 0), (3, 0, 1), (4, 0, 0)]