Python math在命令行中是正确的,而py文件中却是错误的?

您的代码有两个问题:

1) 正如用户2357112所说,您需要在两个减法前后加上括号,这样减法就在除法之前完成了。

str(root[1]-origin[i][0]) 应该是 str(root[1]-origin[i][1])

def N_queens_validator(n):

    if len(set(n))!=len(n):
        return print(f'{n} =>False same row')

    else:
        origin=[(ind,val) for ind,val in enumerate(n)]
        a=origin[:]
        for m in range (len(n)):
            root=a.pop(0)
            for i in range(m+1,len(n)):
                result=(root[0]-origin[i][0])/(root[1]-origin[i][1])
                print(str(root[0]-origin[i][0])+'/'+str(root[1]-origin[i][1])+' the result is: '+str(result))
                if abs(result)==1:
                    return print(f'{n} =>False same diagonal')
        return print(f'{n} =>True')

N_queens_validator([8, 6, 4, 2, 7, 1, 3, 5])

结果:

-1/2 the result is: -0.5
-2/4 the result is: -0.5
-3/6 the result is: -0.5
-4/1 the result is: -4.0
-5/7 the result is: -0.7142857142857143
-6/5 the result is: -1.2
-7/3 the result is: -2.3333333333333335
-1/2 the result is: -0.5
-2/4 the result is: -0.5
-3/-1 the result is: 3.0
-4/5 the result is: -0.8
-5/3 the result is: -1.6666666666666667
-6/1 the result is: -6.0
-1/2 the result is: -0.5
-2/-3 the result is: 0.6666666666666666
-3/3 the result is: -1.0
[8, 6, 4, 2, 7, 1, 3, 5] =>False same diagonal