如何在“按钮"中调用带参数的函数来自“tkinter"的函数蟒蛇包? [英] How to call a function with arguments in "Button" function from "tkinter" python package?

问题描述

1.创建带有选择文件选项的文件对话框1.1 选择文件读取位置的第一个按钮->能够使用以下链接提供的解决方案来做到这一点

1.To create a File Dialog box with an option to select a file 1.1 First button to select file read its location ->Able to do it with the solution provided from below link

filedialog、tkinter 和打开文件

from tkinter import *
from tkinter.filedialog import askopenfilename
from tkinter.messagebox import showerror

class MyFrame(Frame):
    def __init__(self):
        Frame.__init__(self)
        self.master.title("Example")
        self.master.rowconfigure(5, weight=1)
        self.master.columnconfigure(5, weight=1)
        self.grid(sticky=W+E+N+S)

        self.button = Button(self, text="Browse", command=self.load_file, width=10)
        self.button.grid(row=1, column=0, sticky=W)

    def load_file(self):
        fname = askopenfilename(filetypes=(("Template files", "*.tplate"),
                                           ("HTML files", "*.html;*.htm"),
                                           ("All files", "*.*") ))
        if fname:
            try:
                print("""here it comes: self.settings["template"].set(fname)""")
            except:                     # <- naked except is a bad idea
                showerror("Open Source File", "Failed to read file\n'%s'" % fname)
            return


if __name__ == "__main__":
    MyFrame().mainloop()

1.2 第二个按钮开始处理->通过添加另一个按钮开始->添加一个带有参数 process_it 的函数.->所以带参数的函数调用不适用于我的代码

1.2 Second button to start processing ->By adding another button to start ->Adding a function with argument process_it. ->So function call with argument is not working for my code

from tkinter import *
from tkinter.filedialog import askopenfilename
from tkinter.messagebox import showerror

class MyFrame(Frame):
    def __init__(self):
        Frame.__init__(self)
        self.master.title("Example")
        self.master.rowconfigure(5, weight=1)
        self.master.columnconfigure(5, weight=1)
        self.grid(sticky=W+E+N+S)

        self.button = Button(self, text="Browse", command=self.load_file, width=10)
        self.button.grid(row=1, column=0, sticky=W)

        #new code added by me:
        self.button = Button(self, text="Start Now", command=self.process_it(arg_1), width=10)
        self.button.grid(row=2, column=0, sticky=W)

    def load_file(self):
        #new code added by me:
        global arg1 

        fname = askopenfilename(filetypes=(("Template files", "*.tplate"),
                                           ("HTML files", "*.html;*.htm"),
                                           ("All files", "*.*") ))
        #new code added by me:
        arg_1 = fname

        if fname:
            try:
                print("""here it comes: self.settings["template"].set(fname)""")
            except:                     # <- naked except is a bad idea
                showerror("Open Source File", "Failed to read file\n'%s'" % fname)
            return

    # new function added by me:
    def process_it(self, arg_1):
        #use the arg_1 further, example :
        print(arg_1)    


if __name__ == "__main__":
    MyFrame().mainloop()

推荐答案

您可以编写工厂函数来传递一些参数.

You can write factory function to pass some arguments.

def command_factory(arg_1):
    def process_it():
        print(arg_1)
    return process_it

使用

Button(self, text="Start Now", command=command_factory(arg_1))

或者只是

Button(self, text="Start Now", command=lambda: self.proccess_it(arg_1))

但在这种情况下，您需要确保 arg_1 变量不会更改以避免后期绑定.

But in this case you need to be sure that arg_1 variable is not changing to avoid late binding.

这篇关于如何在“按钮"中调用带参数的函数来自“tkinter"的函数蟒蛇包?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！