[英]I can't figure out this Tkinter error
I'm using Python's Tkinter to create a GUI for a project i'm working on. 我正在使用Python的Tkinter为我正在处理的项目创建GUI。
When I try to run part of the code though, I get this error: 当我尝试运行部分代码时,出现此错误:
Traceback (most recent call last):
File "calculator.py", line 59, in <module>
app = Application()
File "calculator.py", line 28, in __init__
self.create_widgets()
File "calculator.py", line 45, in create_widgets
self.special_chars.create_button(char, self.add_char_event(special_characters[char]))
File "calculator.py", line 20, in create_button
self.button_list += Button(self, text = txt, command = fcn)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/
lib-tk/Tkinter.py", line 1206, in cget
TypeError: cannot concatenate 'str' and 'int' objects
The problem is that I can't find the file that the error message references; 问题是我找不到错误消息引用的文件。 my
python2.7/lib-tk
folder only contains complied versions (.pyo and .pyc) of Tkinter. 我的
python2.7/lib-tk
文件夹仅包含Tkinter的编译版本(.pyo和.pyc)。
Is there a way to figure out what's going wrong? 有没有办法找出问题所在?
Here's the source of calculator.py 这是Calculator.py的来源
from Tkinter import *
from exp import full_eval
from maths import special_characters
class special_char_frame(LabelFrame):
def __init__(self, master = None, text = 'Special Characters'):
LabelFrame.__init__(self, master)
self.grid()
self.button_list = []
def create_button(self, txt, fcn):
self.button_list += Button(self, text = txt, command = fcn)
self.button_list[-1].grid(row = 0)
class Application(Frame):
def __init__(self, master = None):
Frame.__init__(self, master)
self.grid()
self.create_widgets()
def create_widgets(self):
## equation entry pane
self.text_entry = Entry(self, width = 100)
self.text_entry.grid(row = 0, column = 0)
self.text_entry.bind('<KeyPress-Return>', self.calculate)
## result pane
self.result = StringVar()
self.result_label = Label(self, textvariable = self.result, wraplength = 815, justify = LEFT)
self.result_label.grid(row = 1, column = 0, columnspan = 2, sticky = W)
self.result.set('')
## calculate button
self.calc_button = Button(self, text = 'Calculate', command = self.calculate)
self.calc_button.grid(row = 0, column = 1)
## special character button pane
self.special_chars = special_char_frame(self)
for char in special_characters:
self.special_chars.create_button(char, self.add_char_event(special_characters[char]))
self.special_chars.grid(column = 0, columnspan = 2, row = 2)
def calculate(self, event = None):
try:
self.result.set(full_eval(self.text_entry.get()))
except Exception as error:
raise
#self.result.set(str(error))
self.text_entry.select_range(0, END)
def add_char_event(self, char):
def add_char(self = self, event = None):
self.text_entry.insert(INSERT, char)
return add_char
app = Application()
app.master.title('Calculator')
app.mainloop()
full_eval
is a function for evaluating mathematical expressions. full_eval
是用于评估数学表达式的函数。
special_characters
is a dict containing special characters and their explanations. special_characters
是包含特殊字符及其说明的字典。 For now it's just special_characters = {'imaginary unit' : u'\ⅈ'}
现在只不过是
special_characters = {'imaginary unit' : u'\ⅈ'}
Ok, so I missed this the first time, but the issue is actually that you are trying to add a Button to a list: 好的,所以我第一次错过了这个,但是问题实际上是您正在尝试将Button添加到列表中:
self.button_list += Button(self, text = txt, command = fcn)
If you simply wrap the Button in brackets, the error goes away (which makes sense because you are supposed to be able to add two lists): 如果仅将Button括在方括号中,那么错误就会消失(这很有意义,因为您应该能够添加两个列表):
self.button_list += [Button(self, text = txt, command = fcn)]
ORIGINAL ATTEMPT 原始尝试
My guess: 我猜:
special_characters
is a dictionary. special_characters
是一本字典。 It has key-value mappings where the values are int
s. 它具有键值映射,其中值是
int
。 Then, when used in self.text_entry.insert(INSERT, char)
, text_entry is trying to insert an int into a str and causing the above error. 然后,当在
self.text_entry.insert(INSERT, char)
,text_entry试图将一个int插入str中并导致上述错误。 The simple solution: wrap char
with str
in add_char
. 简单的解决方案:在
add_char
中用str
包装char
。
def add_char_event(self, char):
def add_char(self = self, event = None):
self.text_entry.insert(INSERT, str(char))
return add_char
Your other option is to wrap str around the special_characters
lookup: 您的另一个选择是将str包裹在
special_characters
查找周围:
for char in special_characters:
self.special_chars.create_button(char,
self.add_char_event(str(special_characters[char])))
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