如何测试Python中的数字是否为正方形？

My code is

我的代码是

if graph == square_grid and type(math.sqrt(nodes)) is not int: 
    print "Your netork can't have that number of nodes" 

Of course this doesn't work because math.sqrt always returns a float. How can I do this?

当然这不起作用，因为math.sqrt总是返回一个浮点数。我怎样才能做到这一点？

3 个解决方案

#1

One way is

一种方法是

int(math.sqrt(x)) ** 2 == x

#2

Because math.sqrt always returns a float, you can use the built in is_integer method

因为math.sqrt总是返回一个浮点数，所以可以使用内置的is_integer方法

def is_square(x):
    answer = math.sqrt(x)
    return answer.is_integer()

this will return True if x is a square and False if it's not

如果x是正方形，则返回True，否则返回False

>>> is_square(25)
True
>>> is_square(14)
False

#3

try:

尝试：

math.sqrt(nodes) == int(math.sqrt(nodes))