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python - TypeError：必须是实数，不是Entry

问题描述

我正在创建一个代码来创建一个计算器，但我不断收到这个错误：

Traceback (most recent call last):
     File "C:\Users\Monish Shah\AppData\Local\Programs\Python\Python36- 
  32\lib\tkinter\__init__.py", line 1702, in __call__
       return self.func(*args)
     File "C:\Users\Monish Shah\AppData\Local\Programs\Python\Python36- 
 32\monish-play\calc-completed-copy-for-editing-copy2.py", line 40, in click
Label (window, text = str(sqrt(n_textentry)), bg = "white") .grid(row = 13, 
  column = 0, sticky = N)
    TypeError: must be real number, not Entry

有谁知道为什么我的代码不起作用？我真的不明白为什么它不能和条目，因为我正在收集用户的输入？我正在研究，但我无法弄清楚如何将用户的输入正确地合并到代码中。

这是我使用的代码：

from math import sqrt
from tkinter import *

window = Tk()
window.title("Welcome to Calculator ")
window.configure(background = "white")
Label (window, text = "Calculator", bg = "white") .grid(row = 0, column = 0, 
sticky = N)


#to create the box for the first number and store it
Label (window, text = "Enter the first number", bg = "white") .grid(row = 1, 
column = 0, sticky = N)
n_textentry = Entry(window, width = 10, bg = "white")
n_textentry.grid(row = 2, column = 0, sticky = N)

#to create the box for the second number
Label (window, text = "Enter the second number", bg = "white") .grid(row = 5, 
column = 0, sticky = N)
m_textentry = Entry(window, width = 10, bg = "white")
m_textentry.grid(row = 6, column = 0, sticky = N)


#click function
def click():
    n_textentry.get()

    m_textentry.get()

    operation_textentry.get()

    if operation_textentry == 1:
        result1 = Label (window, text = str(n_textentry + m_textentry), bg = 
"white") .grid(row = 13, column = 0, sticky = N)
    elif operation_textentry == 2:
         Label (window, text = str(n_textentry - m_textentry), bg = "white") 
.grid(row = 13, column = 0, sticky = N)
    elif operation_textentry == 3:
         Label (window, text = str(n_textentry * m_textentry), bg = "white") 
.grid(row = 13, column = 0, sticky = N)
    elif operation_textentry == 4:
         Label (window, text = str(n_textentry / m_textentry), bg = "white") 
.grid(row = 13, column = 0, sticky = N)
    elif operation_textentry == 5:
         Label (window, text = str(n_textentry ** m_textentry), bg = "white") 
.grid(row = 13, column = 0, sticky = N)
    else:
         Label (window, text = str(sqrt(n_textentry)), bg = "white") 
.grid(row = 13, column = 0, sticky = N)


   # operation_textentry == 6:
     #   Label (window, text = str(sqrt(n_textentry)), bg = "white") 
.grid(row = 13, column = 0, sticky = N)
    #else:
     #   print("Invalid Operation ")




#to show list of options
Label (window, text = '''
Enter 1 for addition
Enter 2 for subtraction
Enter 3 for multiplication
Enter 4 for division
Enter 5 for exponentiation
Enter 6 for square root *This will only work for 1st choice*''', bg = 
"white") .grid(row = 9, column = 0, sticky = W)

operation_textentry = Entry(window, width = 10, bg = "white")
operation_textentry.grid(row = 10, column = 0, sticky = N)
Button(window, text = "Submit", width = 6, command=click) .grid(row = 11, 
column = 0, sticky = N)

标签： pythontkinter

解决方案

尝试将用户输入转换为floator int。您似乎正在尝试对用户输入（Entry对象）应用数学运算，但对象不支持数学运算Entry。

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