从GUI（Tkinter）Python中的函数外部访问变量答案

【问题标题】：Accessing variable from outside the function in GUI (Tkinter) Python从GUI（Tkinter）Python中的函数外部访问变量
【发布时间】：2021-03-16 09:58:34
【问题描述】：

我在 python 中有一个简单的 GUI。我想打印用户从函数外部输入的值。我制作的代码如下所示


def save_BasePath():

    Base_Path_info = Base_Path.get()
    #print(Base_Path_info)

    file_basepath = open("basepath.txt", "w")

    file_basepath.write(str(Base_Path_info))


    file_basepath.close()

app = Tk()
app.geometry("500x500")

app.title("Python File Handling in Forms")

heading = Label(text="Input Print", fg="black", bg="yellow", width="500",
                height="3", font="10")

heading.pack()

Base_Path_text = Label(text="Base_Path :")
Base_Path_text.place(x=155, y=70)
Base_Path = StringVar()
Base_Path_entry = Entry(textvariable=Base_Path, width="30")
Base_Path_entry.place(x=155, y=100)
button_basepath = Button(app, text="Enter Base Path", command=save_BasePath, width="15", height="2", bg="grey")
button_basepath.place(x=175, y=125)

#I need the user input from the function here so that I can use it further

mainloop()

在按下按钮时，我得到了用户输入。我可以从 save_basepath 函数中打印。但我想从外部访问用户输入，以便我可以处理它。任何帮助表示赞赏

【问题讨论】：

您可以使用 Base_Path.get() 从任何函数访问用户输入，那么您的问题到底是什么？

标签： python tkinter tkinter-entry

【解决方案1】：

我们可以使用全局关键字：

from tkinter import *
def save_BasePath():
    global Base_Path_info
    Base_Path_info = Base_Path.get()
    #print(Base_Path_info)

    file_basepath = open("basepath.txt", "w")

    file_basepath.write(str(Base_Path_info))


    file_basepath.close()
    print_it()

def print_it():
    print(Base_Path_info)

app = Tk()
app.geometry("500x500")

app.title("Python File Handling in Forms")

heading = Label(text="Input Print", fg="black", bg="yellow", width="500",
                height="3", font="10")

heading.pack()

Base_Path_text = Label(text="Base_Path :")
Base_Path_text.place(x=155, y=70)
Base_Path = StringVar()
Base_Path_entry = Entry(textvariable=Base_Path, width="30")
Base_Path_entry.place(x=155, y=100)
button_basepath = Button(app, text="Enter Base Path", command=save_BasePath, width="15", height="2", bg="grey")
button_basepath.place(x=175, y=125)

#I need the user input from the function here so that I can use it further


mainloop()

但请记住，我们希望避免这种情况，最好的方法是使用类。

我会这样做：

from tkinter import *

class myProgram:
    def __init__(self):
        heading = Label(text="Input Print", fg="black", bg="yellow", width="500",
                        height="3", font="10")

        heading.pack()

        Base_Path_text = Label(text="Base_Path :")
        Base_Path_text.place(x=155, y=70)
        self.Base_Path = StringVar()
        Base_Path_entry = Entry(textvariable=self.Base_Path, width="30")
        Base_Path_entry.place(x=155, y=100)
        button_basepath = Button(app, text="Enter Base Path", command=self.save_BasePath, width="15", height="2", bg="grey")
        button_basepath.place(x=175, y=125)

    def save_BasePath(self):
        self.Base_Path_info = self.Base_Path.get()

        file_basepath = open("basepath.txt", "w")

        file_basepath.write(str(self.Base_Path_info))


        file_basepath.close()
        self.print_it()

    def print_it(self):
        print(self.Base_Path_info)
        
        # Continue your code here...


app = Tk()
app.geometry("500x500")

app.title("Python File Handling in Forms")
myProgram()
mainloop()

【讨论】：