Tkinter entry和button组合功能在其他功能中不起作用

Question

我创建了一个调用GUI的函数，它有几个条目和一个按钮。 如果我按下按钮，则函数将返回条目上的值

def date_time_gui ():
    win = tk.Tk()
    win.title('powered by Python') # win title
    win.geometry('700x400') # size of win

    # add label on the win
    label = tk.Label(win, 
        text='type the heaving datetime and out water datetime',
        font = ('Arial Bold',25)
        )
    label.place(relx = 0.5, rely = 0.05, anchor = 'n')

    # label and entry for heaving datetime
    heaving_label = tk.Label(win,
        text='type heaving datetime',
        font = ('Arial Bold', 15)
        )
    heaving_label.place(relx = 0.1, rely = 0.3, anchor = 'w')

    h_year_label = tk.Label(win, text='YEAR (4 digits) :')
    h_year_label.place(relx = 0.1, rely = 0.4, anchor = 'w')
    h_year = tk.Entry(win, fg='black', width = 5)
    h_year.place(relx = 0.3, rely = 0.4, anchor = 'w')


    h_month_label = tk.Label(win, text='MONTH (2 digits) :')
    h_month_label.place(relx = 0.1, rely = 0.5, anchor = 'w')
    h_month = tk.Entry(win, fg='black', width = 5)
    h_month.place(relx = 0.3, rely = 0.5, anchor = 'w')


    h_date_label = tk.Label(win, text='DATE (2 digits) :')
    h_date_label.place(relx = 0.1, rely = 0.6, anchor = 'w')
    h_date = tk.Entry(win, fg='black', width = 5)
    h_date.place(relx = 0.3, rely = 0.6, anchor = 'w')


    h_hour_label = tk.Label(win, text='HOUR (24h, 2 digits) :')
    h_hour_label.place(relx = 0.1, rely = 0.7, anchor = 'w')
    h_hour = tk.Entry(win, fg='black', width = 5)
    h_hour.place(relx = 0.3, rely = 0.7, anchor = 'w')

    h_minute_label = tk.Label(win, text='MINUTE (2 digits) :')
    h_minute_label.place(relx = 0.1, rely = 0.8, anchor = 'w')
    h_minute = tk.Entry(win, fg='black', width = 5)
    h_minute.place(relx = 0.3, rely = 0.8, anchor = 'w')



    # label and entry for out water datetime
    outwater_label = tk.Label(win,
        text='type out water datetime',
        font = ('Arial Bold', 15)
        )
    outwater_label.place(relx = 0.5, rely = 0.3, anchor = 'w')

    o_year_label = tk.Label(win, text='YEAR (4 digits) :')
    o_year_label.place(relx = 0.5, rely = 0.4, anchor = 'w')
    o_year = tk.Entry(win, fg='black', width = 5)
    o_year.place(relx = 0.7, rely = 0.4, anchor = 'w')


    o_month_label = tk.Label(win, text='MONTH (2 digits) :')
    o_month_label.place(relx = 0.5, rely = 0.5, anchor = 'w')
    o_month = tk.Entry(win, fg='black', width = 5)
    o_month.place(relx = 0.7, rely = 0.5, anchor = 'w')


    o_date_label = tk.Label(win, text='DATE (2 digits) :')
    o_date_label.place(relx = 0.5, rely = 0.6, anchor = 'w')
    o_date = tk.Entry(win, fg='black', width = 5)
    o_date.place(relx = 0.7, rely = 0.6, anchor = 'w')


    o_hour_label = tk.Label(win, text='HOUR (24h, 2 digits) :')
    o_hour_label.place(relx = 0.5, rely = 0.7, anchor = 'w')
    o_hour = tk.Entry(win, fg='black', width = 5)
    o_hour.place(relx = 0.7, rely = 0.7, anchor = 'w')

    o_minute_label = tk.Label(win, text='MINUTE (2 digits) :')
    o_minute_label.place(relx = 0.5, rely = 0.8, anchor = 'w')
    o_minute = tk.Entry(win, fg='black', width = 5)
    o_minute.place(relx = 0.7, rely = 0.8, anchor = 'w')

    def run_func ():
        global heaving
        global outwater
        heaving = h_year.get()+'.'+h_month.get()+'.'+h_date.get()+' '+h_hour.get()+' '+h_minute.get()
        outwater = o_year.get()+'.'+o_month.get()+'.'+o_date.get()+' '+o_hour.get()+' '+o_minute.get()
        print('here')
        win.destroy()
        print('there')
        return heaving, outwater
    print('else')
    button = ttk.Button(win, text = 'run', command = run_func)  
    button.place(relx = 0.8, rely = 0.9, anchor = 'w')
    print('this')
    win.mainloop()
    print('where')
    return heaving, outwater

如果我在同一个脚本中使用以下代码运行它，它就会工作

if __name__ == "__main__":
    h, o = date_time_gui()
    print(h,o)

它打印出h，o，这是函数date\u time\u gui的返回值

但是，如果我将此函数应用于其他定义，如

def other_def():
    ## some code
    heaving_datetime, out_water_datetime = date_time_gui()

它只是停止工作

我想检查date\u time\u gui中的哪一行是问题所在，所以我打印了“there”、“where”等

当我运行另一个_def时，它会打印出来 其他的 这 在这里 那里

然后没有打印出“在哪里”

我真的不知道是什么问题，因为date\u time\u gui函数本身工作得很好。 当我将此应用于其他函数时，它不起作用

• 也许，为了运行另一个_def，我制作了一个gui，其中包含运行另一个_def的复选框。 因此，如果我检查gui上的其他_def函数并点击运行按钮，gui将被销毁，其他_def将运行。新的日期时间图形用户界面弹出并点击运行按钮，然后图形用户界面被破坏并停止工作

Answer 1

使用tkinter窗口时

• 调用loop（）方法将激活tkinter消息泵，并将停止线性python代码，直到窗口关闭
• 您可以通过手动关闭窗口或从代码中调用quit（）退出循环

在您的例子中，调用win.mainloop()停止了线性脚本

您可以通过向run_func函数添加win.quit()来退出循环

请尝试以下代码：

    def run_func ():
        global heaving
        global outwater
        heaving = h_year.get()+'.'+h_month.get()+'.'+h_date.get()+' '+h_hour.get()+' '+h_minute.get()
        outwater = o_year.get()+'.'+o_month.get()+'.'+o_date.get()+' '+o_hour.get()+' '+o_minute.get()
        print('here')
        win.destroy()
        print('there')
        win.quit()   # exit gui loop
        return heaving, outwater  # not needed
    
    print('else')
    button = ttk.Button(win, text = 'run', command = run_func)  
    button.place(relx = 0.8, rely = 0.9, anchor = 'w')
    print('this')
    win.mainloop()  # python code stops here until window closed
    print('where')
    heaving, outwater = 3,4  # for testing
    return heaving, outwater

if __name__ == "__main__":
    h, o = date_time_gui()
    print(h,o)

输出

else
this
here
there
where
3 4