即使我输入正数，Tkinter 输入框也会返回零值

Question

我正在尝试创建一个程序，让用户 select 特定的时间范围并显示相关的股票价格图。但是现在即使我输入了一些正常的数字，Python 也只会 return 这个错误信息。非常感谢任何帮助。

第二个代码块是我的按钮和条目。理想情况下，在输入开始日期和结束日期后，单击提交按钮后，应该触发第一个代码块，即显示功能。

Exception in Tkinter callback
Traceback (most recent call last):
File "D:\Casual Softwares\python\lib\tkinter\__init__.py", line 1699, in 
__call__
    return self.func(*args)
File "D:/Casual Softwares/python/untitled/UPDATING GRAPH.py", line 56, in 
show
start = dt.datetime(sY, sM, sD)
ValueError: year 0 is out of range

这里是相关代码

def show():
    global startD
    global startM
    global startY
    global endD
    global endM
    global endY
    global coy
    global firm
    sY=startY.get()
    sM=startM.get()
    sD=startD.get()
    eY=endY.get()
    eM=endM.get()
    eD=endD.get()

    if firm==False:
        popupmsg('Please Select A Company First')
    else:
        fig = plt.figure(figsize=(7, 5))
        ax1 = plt.subplot2grid((6, 1), (0, 0), rowspan=4, colspan=1)
        ax2 = plt.subplot2grid((6, 1), (4, 0), rowspan=2, colspan=1, sharex=ax1)
        ax1.clear()
        ax2.clear()
        start = dt.datetime(sY, sM, sD)
        end = dt.datetime(eY, eM, eD)
        df = web.get_data_yahoo(coy, start, end)
        ax1.plot(df.index, df['Adj Close'], label='Adjusted Close')
        ax2.bar(df.index, df['Volume'], label='Volume', width=25, color='c')
        for label in ax2.xaxis.get_ticklabels():
            label.set_rotation(45)
        ax1.set_title(coy)
        ax1.legend(bbox_to_anchor=(0, 1.02, 1, .102), loc=3, ncol=2, 
borderaxespad=0)
        ax2.legend()
        canvas = FigureCanvasTkAgg(fig, master=root)
        canvas.get_tk_widget().grid(row=1, column=1)
        toolbar = NavigationToolbar2TkAgg(canvas, root)
        toolbar.update()
        canvas.show()
        canvas.draw()

def changePeriod():
    global startD
    global startM
    global startY
    global endD
    global endM
    global endY
    startD = IntVar()
    startM = IntVar()
    startY = IntVar()
    endD = IntVar()
    endM = IntVar()
    endY = IntVar()
    period = tk.Tk()
    period.wm_title('Periods')
    button1 = ttk.Button(period, text='Submit', width=10,command=show)
    button1.grid(row=5, columnspan=4, sticky='s')
    label = ttk.Label(period, text='Enter Dates',font=MID_FONT)
    label.grid(row=0,columnspan=4,sticky='n')
    label2=ttk.Label(period,text='Days')
    label3=ttk.Label(period,text='Months')
    label4=ttk.Label(period,text='Years')
    label5=ttk.Label(period,text='Start',font=MID_FONT)
    label2.grid(row=2,column=0)
    label3.grid(row=3, column=0)
    label4.grid(row=4, column=0)
    label5.grid(row=1, column=0)

    entry1 = ttk.Entry(period,textvariable=startD,width=10)
    entry1.insert(0, 1)
    entry2 = ttk.Entry(period,textvariable=startM,width=10)
    entry2.insert(0, 1)
    entry3 = ttk.Entry(period,textvariable=startY,width=10)
    entry3.insert(0, 2010)
    entry1.grid(row=2,column=1)
    entry2.grid(row=3, column=1)
    entry3.grid(row=4, column=1)
    entry1.focus_set()

    label6 = ttk.Label(period, text='Days')
    label7 = ttk.Label(period, text='Months')
    label8 = ttk.Label(period, text='Years')
    label9 = ttk.Label(period, text='End',font=MID_FONT)
    label6.grid(row=2, column=2)
    label7.grid(row=3, column=2)
    label8.grid(row=4, column=2)
    label9.grid(row=1, column=2)

    entry4 = ttk.Entry(period,textvariable=endD,width=10)
    entry4.insert(0, 20)
    entry5 = ttk.Entry(period,textvariable=endM,width=10)
    entry5.insert(0, 9)
    entry6 = ttk.Entry(period,textvariable=endY,width=10)
    entry6.insert(0, 2017)
    entry4.grid(row=2, column=3)
    entry5.grid(row=3, column=3)
    entry6.grid(row=4, column=3)

    period.mainloop()

Answer 1

通过执行 entry1.insert(0, 1)，您正在解决 IntVar 的问题，因此它的值永远不会更新为初始值。相反，使用 startD.set(1)。 startM、startY、endD、endM 和 endY.

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