无法将Tkinter输入框字符串值转换为整数值

时间：2015-07-30 22:06:19

标签： user-interface python-3.x tkinter

简介：

大家好，我没有编程方面的经验，并且毫不奇怪我的第一个程序遇到了一些困难...如果有人能帮助我克服这条路上的驼峰，那将是有责任的。

我的问题背景：

我在从Tkinter输入框调用整数时遇到问题。设置如下，我有一个带描述符标签的框架，一个输入框，一个确认按钮和一个确认标签。我想到的设计是让用户输入一个数字，点击确认按钮，这会导致存储输入并更新确认标签。这部分我没有任何问题，并且按照希望工作...... 

from tkinter import *

root = Tk()
root.geometry('450x700+10+10')
root.title("Design Suite Version: 1.0")


#Creating a labelframe for my entry box/button and confirmation label
myframe2 = LabelFrame(root, text =  '2: Limit state design selections:')
myframe2.grid(row=0, column=1, padx=5, pady=5, sticky = 'nw')

#Label identifying input I expect in my entry box...
Label(myframe2,
      text="Proposed Member Depth:",
      justify = LEFT).grid(row=21, column=0, padx=5, pady=5)

#Constructing the function for the self updating label
def Selection6():
    #text expected in the confirmation label
    labeltext6 = "Depth(mm) = " + str(var6.get())
    #configuring the updating label
    label6.config(text = labeltext6, fg='red', padx=5, pady=5)

#confirmation label location
label6 = Label(myframe2)
#confirmation label location
label6.grid(row=27,  column=0, padx=0, pady=5)

#set what var is here
var6 = IntVar()
# initializing the choice
var6.set('0')

#this is my first entry box
entry6 = Entry(myframe2, textvariable=var6, width = 25)
entry6.grid(row=25, column=0, padx=5, pady=5)
#this is my first button, when clicked, runs Selection6
button = Button(myframe2, text="Click to Confirm",width = 20, 
                command = Selection6)
button.grid(row=26, column=0, padx=5, pady=0)

##########################################################################
#Creating a 2nd label for my entry box/button and confirmation label
Label(myframe2,
      text="Proposed Member Width:",
      justify = LEFT).grid(row=28, column=0,padx=5, pady=5)


def Selection6a():
    labeltext6a = "Width(mm) = " + str(var6a.get())
    label6a.config(text = labeltext6a, fg='red', padx=5, pady=5)

label6a = Label(myframe2)
label6a.grid(row=31, column=0, padx=0, pady=5)

var6a = IntVar()
var6a.set('0')

entry6a = Entry(myframe2, textvariable=var6a, width = 25)
entry6a.grid(row=29, column=0, padx=5, pady=5, sticky = 'w')

button = Button(myframe2, text="Click to Confirm",width = 20,
                command = Selection6a)
button.grid(row=30, column=0, padx=5, pady=0)
mainloop()

初始问题：

我最初遇到困难的地方是当我尝试从我的两个输入框（上面）获取变量输入并通过添加以下代码在我的程序（下面）中使用我的GUI进一步使用它们时... / p> 

##########################################################################
#Creating a 3rd label for my button and confirmation label
Label(myframe2,
  text="Member Modulus:",
  justify = LEFT).grid(row=32, column=0,padx=5, pady=5)


def Selection7():
    labeltext7 = "Modulus(mm cubed) = ",
    + (((str(var6a.get()) * (str(var6.get()))**2))/6)
    label7.config(text = labeltext7, fg='red', padx=5, pady=5)

label7 = Label(myframe2)
label7.grid(row=34, column=0, padx=0, pady=5)

var7 = IntVar()
var7.set('0')


button = Button(myframe2, text="Click for Modulus",width = 20,
                command = Selection7)
button.grid(row=33, column=0, padx=5, pady=0)
mainloop()

当我尝试在函数中使用var6.get（）和var6a.get（）来更新标签时，我遇到如下错误：

    labeltext7 = "Modulus(mm cubed) = " + (((str(var6a.get()) * (str(var6.get()))**2))/6)TypeError: unsupported operand type(s) for ** or pow(): 'str' and 'int' Exception in Tkinter callback

尝试修复：

我试图通过重写我的函数将字符串转换为整数，如下所示.... 

def Selection7():
labeltext7 = "Modulus(mm cubed) = ",
+ (((int(var6a.get()) * (int(var6.get()))**2))/6)
label7.config(text = labeltext7, fg='red', padx=5, pady=5)

当前问题：

当我通过Selection7()致电button = Button(myframe2, text="Click for Modulus"时，我没有将计算出的值输出到labeltext7。脚本现在执行正常，没有错误，这是我的问题，我无法得到计算输出函数...欢迎提出任何意见，建议或建议！

该网站建议的一些帖子我已阅读但无法找到答案：

How to get values from entry box with tkinter

tkinter set values in entry box

https://stackoverflow.com/questions/26935846/tkinter-entry-box-issues

Python posting answer from function to entry box in GUI

http://effbot.org/tkinterbook/entry.htm

UPDATE1：

嗨再次，感谢您抽出时间发表评论并回答。我包含了一个docstring来解释我希望用我的函数实现的内容，希望这会进一步澄清请求。

我将紧凑的代码分成了小块，并根据建议删除了逗号。

这是修改后的代码部分，我仍然无法输出所需的功能，感谢任何帮助。

Label(myframe2,
  text="Member Modulus:",
  justify = LEFT).grid(row=32, column=0,padx=5, pady=5)

"""
Selection 7()_Member Modulus: 

Modulus for a rectangular section:
(Width of member x depth of member squared) divided by 6
width:var6a depth:var6 
"""

def Selection7():
    wdth = int(var6a.get())
    dpth = int(var6.get())
    dpthsqrd = int(dpth**2)
    wdth_dpthsqrd = int((wdth * dpthsqrd))
    mod = int(wdth_dpthsqrd/6)

    labeltext7 = "Modulus (mm cubed) = " 
    + int(mod)
    label7.config(text = labeltext7, fg='red', padx=5, pady=5)

label7 = Label(myframe2)
label7.grid(row=34, column=0, padx=0, pady=5)

var7 = IntVar()
var7.set('0')


button = Button(myframe2, text="Click for Modulus",width = 20,
                command = Selection7)
button.grid(row=33, column=0, padx=5, pady=0)
mainloop()

UPDATE1.1：

大家好，在更新1中，我应该扩展我的问题。问题是defSelection7()中的计算没有像labeltext7那样显示在GUI上，因为Modulus (mm cubed) =是Selection7时文本int(mod)显示在GUI上已激活，但计算defSelection7()不是。

UPDATE2：

更幸福的是，我的问题已经解决，我已设法让int(mod)显示labeltext7 int(mod)部分,移动""" Selection 7()_Member Modulus: Modulus for a rectangular section: (Width of member x depth of member squared) divided by 6 width:var6a depth:var6 """ def Selection7(): wdth = int(var6a.get()) dpth = int(var6.get()) dpthsqrd = (dpth**2) wdth_dpthsqrd = (wdth * dpthsqrd) mod = (wdth_dpthsqrd/6) labeltext7 = "Modulus (mm cubed) = ", mod label7.config(text = labeltext7, fg='red', padx=5, pady=5) label7 = Label(myframe2) label7.grid(row=34, column=0, padx=0, pady=5) var7 = IntVar() var7.set('0') button = Button(myframe2, text="Click for Modulus",width = 20, command = Selection7) button.grid(row=33, column=0, padx=5, pady=0) mainloop() 一行包括labeltext7 = "Modulus (mm cubed) = " + int(mod)。

请参阅下面的修订代码。

labeltext7 = "Modulus (mm cubed) = ", mod

我很高兴我的GUI功能如预期的那样。如果有人可以发布一个链接供我阅读，这将有助于我确定我的修订工作的原因，我会更高兴{压缩int(mod) 来自UPDATE1 到此UPDATE2修订版<div id="score">50</div> 然后我的GUI按预期更新，正确地将计算div拉到并显示到＆＃39; labeltext7＆＃39;。

1 个答案:

答案 0 :(得分：0)

删除逗号应该有效：

def Selection7():
    labeltext7 = "Modulus(mm cubed) = "
    + (((int(var6a.get()) * (int(var6.get()))**2))/6)
    label7.config(text = labeltext7, fg='red', padx=5, pady=5)

还是更好：

def Selection7():
    width = int(var6a.get())
    labeltext7 = "Modulus(mm cubed) = " + (width**3/6) 
    label7.config(text = labeltext7, fg='red', padx=5, pady=5)
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