代码本意是想用来解方程，但是输出却总是无解。

x = -100.000000
left = x+1
right = x*2
total = 0
while x<= 100.00:
    mid = left - right
    
    if left == right:
        print("x = " +x+"   "  +mid)
        total = total + 1
    x = x + 0.001
    

if total == 0:
    print("The equatioon doesn't have a solution.")
elif total == 1:
    print("The equatioon only have a solution.")
else:
    print("There are %d solutions in total.",total)

浮点数不能用==来判断是否一致

可是即使改成这样还是不行

while x<= 100.00:
    mid = left - right
    
    if mid < 0.001 and mid > -0.001:
        print("x = " +x+"   "  +mid)
        total = total + 1
    x = x + 0.001

没改之前的程序，left和right在循环外赋值，所以不管循环多少次，left和right都不变，total肯定为0
修改后的程序，还是如此，mid不会变化的，total也不会变，所以无解。

谢谢，可是为什么输出的数据这么诡异，如果我想让它好看一点该怎么办

x = -100.000000

total = 0
while x<= 100.00:
    left = x+1
    right = x*2
    mid = left - right
    
    if mid < 0.001 and mid > -0.001:
        print("x = " +str(x) +"   "  +str(mid))
        total = total + 1
    x = x + 0.001
    

if total == 0:
    print("The equatioon doesn't have a solution.")
elif total == 1:
    print("The equatioon only have a solution.")
else:
    print("There are " + str(total)+" solutions in total.")

保留6位小数：
print("x = " +str(x) +"   "  +str(mid))换成
print("x = %f"  %x + "    mid = %f" %mid)

谢谢大佬