下面的代碼讓我選擇三樣東西Combobox，然后根據我選擇的東西，函式會做一些基本的計算。
import openpyxl
from tkinter import *
import tkinter.ttk as ttk
from openpyxl import Workbook # or "from openpyxl import Workbook": create workbook
from openpyxl import load_workbook # open/excess excel file or spreadsheet existed
def selected1(event):
global var1
if mycombobox.get() == 'clam shell':
var1 = 1
return var1
if mycombobox.get() == '360\u00b0':
var1 = 2
return var1
def selected2(event):
global var2
if mycombobox1.get() == 'hinge':
var2 = 3
return var2
if mycombobox1.get() == 'top':
var2 = 4
return var2
def selected3(event):
global var3
if mycombobox2.get() == 'hinge':
var3 = 5
return var3
if mycombobox2.get() == 'top':
var3 = 6
return var3
def sol_analysis(selected1,selected2,selected3):
var4 = var1 var2 var3
return var4
# ========================= main ==============================
root = Tk()
root.title('Industry Solution')
root.geometry("500x800")
# === Type ===
label_a = Label(root, text="1. type of computer")
label_a.pack(side = TOP, pady=1)
type_com = ['Type', 'clam shell', '360\u00b0']
mycombobox = ttk.Combobox(root, values = type_com)
mycombobox.current(0)
mycombobox.bind('<<ComboboxSelected>>',selected1)
mycombobox.pack(side = TOP, pady=1)
# === WLAN1 position ===
label_b = Label(root, text="2. WLAN1 antenna position")
label_b.pack(side = TOP, pady=1)
WLAN1_ant = ['WLAN1 ant. position', 'hinge', 'top']
mycombobox1 = ttk.Combobox(root, values = WLAN1_ant)
mycombobox1.current(0)
mycombobox1.bind('<<ComboboxSelected>>',selected2)
mycombobox1.pack(side = TOP, pady=1)
# === WLAN2 position ===
label_c = Label(root, text="3. WLAN2 antenna position")
label_c.pack(side = TOP, pady=1)
WLAN2_ant = ['WLAN2 ant. position', 'hinge', 'top']
mycombobox2 = ttk.Combobox(root, values = WLAN2_ant)
mycombobox2.current(0)
mycombobox2.bind('<<ComboboxSelected>>',selected3)
mycombobox2.pack(side = TOP, pady=1)
# === Result ===
sol_analysis(selected1,selected2,selected3)
root.mainloop()
在我的代碼中，我想在進行計算之前選擇三件事。但是，當我運行代碼時，錯誤在選擇任何內容之前就出現了。
我得到的錯誤是：
NameError: name 'var1' is not defined
我通過global vari.
uj5u.com熱心網友回復：
global var1不“宣告”變數；它的作用更像是“當您參考名為 的變數時var1，請查看全域命名空間”。沒有這樣的變數，因此錯誤。
Python 3.8.10 (default, Sep 28 2021, 16:10:42)
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> def get_var1():
... global var1
... return var1
...
>>> get_var1()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 3, in get_var1
NameError: name 'var1' is not defined
>>> var1 = 10
>>> get_var1()
10
嘗試初始化 var1 等，然后再呼叫sol_analysis, 說 0，您將不會收到名稱錯誤。
我不認為這段代碼會做你想要的：你需要sol_analysis從某個東西觸發，也許是你 GUI 中的一個按鈕。
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