如何显示“正在加载...”，然后在tkinter中单击按钮后运行脚本？

debugcn 发表于 Dev

Christina Zhou

我想显示“正在加载...”，然后在用户等待时执行脚本。

我了解到画布只能在每个循环之后进行更新，并且在按钮命令被调用时画布被冻结。

我该如何解决？

当前，没有文本出现。成功文本不会出现。

import tkinter as tk
import main


root = tk.Tk()  # create GUI instance
root.title('Exam Closeout')  # name GUI

def run_script():
    '''
    Run the script from main, that is, the data script.

    :return: void
    '''
    # show loading status: currently doesn't work, need to understand queue better
    current_text = tk.StringVar()
    current_text.set('Loading...')
    tk.Label(root, textvariable=current_text).grid(row=4, column=1, sticky='w')
    subject = entry_1.get() # grab subject from user input
    try:
        # call main
        main.test(subject)
        # show finish status
        current_text.set('Script successfully finished. You may exit out of this window now')
    except Exception as e:   # catch exceptions. currently doesn't show specific exception
        current_text.set("Error occurred. Try looking at documentation")


# label with instructions
tk.Label(root, text="Thank you for using me...").grid(row=1, column=1, sticky='w')

# label to show users where to enter exam
tk.Label(root, text="Enter exam code:").grid(row=2, column=1, sticky='w')

# blank box to enter exam into
entry_1 = tk.Entry(root,width=40)   # entry has to be its own line - for more, see below
entry_1.grid(row=2, column=2, columnspan=2)

# button to run script
tk.Button(root,text="Run", command=run_script).grid(row=3, column=3)

# start canvas
root.mainloop()

main.py

import time

def test(exam):
    time.sleep(5)
    print(exam)

如果重要的话，main方法实际上是一个数据分析脚本，它接收数据框，对其进行操作并导出Excel数据集。

马蒂诺

update_idletasks()在下面指示的位置向通用窗口小部件方法添加调用：

def run_script():
    '''
    Run the script from main, that is, the data script.

    :return: void
    '''
    # Show loading status.
    current_text = tk.StringVar()
    current_text.set('Loading...')
    tk.Label(root, textvariable=current_text).grid(row=4, column=1, sticky='w')
    subject = entry_1.get() # grab subject from user input
    try:
        root.update_idletasks()  #### ADD THIS LINE ####
        # call main
        main.test(subject)
        # show finish status
        current_text.set('Script successfully finished. '
                         'You may exit out of this window now')
    except Exception as e:  # Catch exceptions.
        current_text.set("Error occurred. Try looking at documentation")

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