python - 无法将 tkinter 回调值传递给函数

Question

def browse_button():

    ## Store the path as a global variable
    global folder_path
    filename = filedialog.askdirectory()
    folder_path.set(filename)
    print(filename)
    return folder_path

def outputfile():

    global out_path
    filepath = filedialog.asksaveasfilename(filetypes = (("CSV","*.csv"),("all files","*.*")))
    out_path.set(filepath)
    print (filepath)
    return out_path

## Instantiating root widget
root = Tk()

# StringVar and IntVar are a type of control variable. 
#These store values needed later

folder_path= StringVar()
out_path = StringVar()
h20_yr = IntVar()  

wy_lbl= Label(root, text = "Water Year: ")
wy_lbl.grid( row = 0, column = 1)

wy_entry = Entry(root)
wy_entry.grid(row = 0, column = 2)

lbl1 = Label(root, textvariable = folder_path)
lbl1.grid(row = 1, column=1)

browse = Button(text="Input Folder", command=browse_button)
browse.grid(row=1, column=2)

lbl2 = Label(root, textvariable= out_path)
lbl2.grid(row =2, column = 1)

save_as = Button(text = 'Save Output', command = outputfile)
save_as.grid(row = 2, column = 2)

print( folder_path.get(), out_path.get(), h20_yr.get())

新手python用户在这里。

所选文件夹和输出文件的标签填充和文件路径通过作为按钮命令的函数调用毫无问题地打印。为什么这些不全局存储？我需要将这些值传递给运行程序的现有代码。

提前致谢。

标签： pythontkinter