同时使用一个检查按钮和一个按钮

Question

我是 Python 新手，在使用检查按钮时显然遗漏了一些重要的东西。这是我的程序背后的想法：我手动选择一个文件，然后根据是否选中复选框，使用按钮触发一个计算序列或另一个。为此，我想使用 .get() 命令验证复选框的状态。

我发现只有一个序列始终被触发，与复选框的状态无关。当我点击复选框时，.get() 没有更新。我究竟做错了什么？任何帮助将不胜感激。

from tkinter import *
from tkinter import filedialog
import tkinter as tk

master = Tk()
root = tk.Tk()

col_sep = "\t"

col_h_b = []  # field column for background
col_m_b = []  # magnetization column for background

def choose_b_file():
    root.fileName_b = filedialog.askopenfilename(filetypes=((".dat files", "*.dat"), ("All files", "*.*")))
    with open(root.fileName_b, 'r') as f:
         for line in f:
            if line[0] != "#":
                linedata = [float(line.split(col_sep)[i]) for i in range(len(line.split(col_sep)))]
                col_h_b.append(linedata[4])
                col_m_b.append(linedata[5])
    print(f.name)

offset = BooleanVar()
checkbox = tk.Checkbutton(root, text="offset subtraction", variable=offset,onvalue=1, offvalue=0)
checkbox.pack()

def plot():
    if offset.get() == 1:
        #some mathematical operations and graph plotting
    else:
        #other mathematical operations and graph plotting

def close_window():
    exit()

b_data = Button(master, text="Background", width=20, command=choose_b_file)
m_minus_b = Button(master, text="Plot", width=5, command=plot)
quit = Button(master, text="Quit", width=5, command=close_window)

b_data.pack()
m_minus_b.pack()
quit.pack()

root.mainloop()

Answer 1

您主要是在搞乱父母的小部件root 和master。 复选框需要单独的窗口吗？

否则，快速解决方法是在创建复选框时将root 替换为master：

checkbox = tk.Checkbutton(root, text="offset subtraction" ...)

你也可以简化布尔的东西，checkbutton的默认行为是使用0和1，去掉master或者root，只选择一个。

from tkinter import *
from tkinter import filedialog

root = Tk()

col_sep = "\t"    
col_h_b = []  # field column for background
col_m_b = []  # magnetization column for background

def choose_b_file():
    root.fileName_b = filedialog.askopenfilename(filetypes=((".dat files", "*.dat"), ("All files", "*.*")))
    with open(root.fileName_b, 'r') as f:
         for line in f:
            if line[0] != "#":
                linedata = [float(line.split(col_sep)[i]) for i in range(len(line.split(col_sep)))]
                col_h_b.append(linedata[4])
                col_m_b.append(linedata[5])
    print(f.name)

def plot():
    if offset.get() == 1:
        print('True')
        #some mathematical operations and graph plotting
    else:
        print('False')
        #other mathematical operations and graph plotting

def close_window():
    exit()

offset = IntVar()
checkbox = Checkbutton(root, text="offset subtraction", variable=offset)
checkbox.pack()

b_data = Button(root, text="Background", width=20, command=choose_b_file)
m_minus_b = Button(root, text="Plot", width=5, command=plot)
quit = Button(root, text="Quit", width=5, command=close_window)

b_data.pack()
m_minus_b.pack()
quit.pack()

root.mainloop()