我正在尝试使用 tkinter 读取 .xlsx 工作表。但是代码发布了“TypeError:'NoneType' 对象不可订阅”的错误。我已经对它进行了足够的试验,但无法理解代码的问题。
import openpyxl
from tkinter import filedialog
from tkinter import *
class data:
def __init__(self,master):
self.master = master
master.title("App")
master.geometry("600x200")
master.resizable(0,0)
x,y = 30,20
self.options = ['A',"B"]
self.om_variable = StringVar()
# self.om_variable.set(self.options[0])
# self.om_variable.trace('w', self.option_select)
self.om = OptionMenu(self.master, self.om_variable, *self.options).place(x = x+300,y = y+80)
Brw_2 = Button(master = self.master, text = 'Browse', width = 6, command=self.update_option_menu).place(x = x+500,y = y+40)
def update_option_menu(self):
self.om_variable.set('')
self.om["menu"].delete(0, "end")
xyx = self.get_SheetsName(r"C:\_Code\Inputs\SomeExcelFile.xlsx")
print("---->",xyx)
for string in xyx:
self.om["menu"].add_command(label=string,
command=lambda value=string: self.om_variable.set(value))
def get_SheetsName(self, excel_file):
wb = openpyxl.load_workbook(excel_file)
SH_lst = wb.sheetnames
Sh_names = [sh for sh in SH_lst if "AllTags" in sh]
return Sh_names
root = Tk()
myGui = data(root)
root.mainloop()
答案 0 :(得分:1)
这是一个常见的错误。当你写这篇文章时:
self.om = OptionMenu(self.master, self.om_variable, *self.options).place(x = x+300,y = y+80)
Python 创建了一个选项菜单,然后调用了 .place()
方法。 None
的结果保存到 self.om
。您想要的是创建选项菜单,然后将其存储在使用 self.om
.place()
then 中
所以你基本上python解释它是这样的:
temp_var = OptionMenu(self.master, self.om_variable, *self.options)
self.om = temp_var .place(x = x+300,y = y+80)
del temp_var
你应该写的是:
self.om = OptionMenu(self.master, self.om_variable, *self.options)
self.om.place(x = x+300,y = y+80)
提示:切勿在调用构造函数后直接调用 grid
/place
/pack
而不将对象保存到变量中。