创建python GUI计算器，但平方根函数给我带来了问题

Question

当我在运行程序时立即使用平方根函数时，它工作得很好。问题是，例如，如果我加8+8，那么在输出（16）上使用平方根函数。然后我得到了错误

    Exception in Tkinter callback
    Traceback (most recent call last):
      File "C:\Users\bigfe\Anaconda3\lib\tkinter\__init__.py", line 1705, in __call__
        return self.func(*args)
      File "C:/Users/bigfe/.spyder-py3/APython/net/Calc.py", line 124, in squareroot
        textbox.insert(0, math.sqrt(f_num))
    AttributeError: 'str' object has no attribute 'sqrt' 

我尝试了一切，甚至确认加法函数的输出是一个浮点，但它仍然给我错误

这是我的密码

    textbox = Entry(calc, font = ('arial',20, 'bold'), bd = 30, width = 27, bg = 'gray', justify=RIGHT)
    textbox.grid(row = 0, column = 0, columnspan = 4, pady=1 )
    #This is what is shown in the entry box
    textbox.insert(0, 0)

    def numEnter(num):
        if(textbox.get() == '0'): 
            textbox.delete(0, END)
        current = textbox.get()
        textbox.delete(0, END)
        ak = textbox.insert(0, str(current) + str(num))


    def clear():
        textbox.delete(0, END)
        textbox.insert(0, 0)

    def allClear():
        textbox.delete(0, END)
        textbox.insert(0, 0)
        current = 0

    def add():
        firstnum = textbox.get()
        global f_num
        global math
        f_num = float(firstnum)
        math = 'addition'
        textbox.delete(0, END)

    def subtract():
        firstnum = textbox.get()
        global f_num
        global math
        f_num = float(firstnum)
        math = 'subtraction'
        textbox.delete(0, END)

    def multiply():
        firstnum = textbox.get()
        global f_num
        global math
        f_num = float(firstnum)
        math = 'multiplication'
        textbox.delete(0, END)

    def divide():
        firstnum = textbox.get()
        global f_num
        global math
        f_num = float(firstnum)
        math = 'division'
        textbox.delete(0, END)

    def squareroot():
        firstnum = textbox.get()
        global f_num
        global math

        f_num = float(firstnum)
        textbox.delete(0, END)
        textbox.insert(0, math.sqrt(f_num))

    def pi():
        if(textbox.get() == 0): 
            textbox.delete(0, END)
        textbox.insert(0, float(math.pi))
        global frst
        frst = textbox.get()



    def equal():
        if (math == 'addition'):
            second_num = textbox.get()
            textbox.delete(0, END)
            global ans
            ans = (f_num + float(second_num))
            print(type(ans))
            textbox.insert(0, ans)

        elif (math == 'subtraction'):
            second_num = textbox.get()
            textbox.delete(0, END)
            textbox.insert(0, f_num - float(second_num))

        elif (math == 'multiplication'):
            second_num = textbox.get()
            textbox.delete(0, END)
            textbox.insert(0, f_num * float(second_num))

        elif (math == 'division'):
            second_num = textbox.get()
            textbox.delete(0, END)
            textbox.insert(0, f_num / float(second_num))

我省略了构造计算器的代码，因为我认为这是不必要的。如果你想看到任何其他部分的代码，请让我知道

Answer 1

只需将您正在使用的“math”变量的名称更改为任何其他您认为与您正在导入的数学函数重叠的变量