Question

在感谢另一个成员定义我的单词计数方法之后，我现在正在创建一个GUI来配合它。我创建了三个按钮，一个用于浏览文件，一个用于计算文件中的单词和行，另一个用于退出。

我的问题是，如何让这些按钮做事？我正在尝试使“浏览文件”运行filename = fileopenbox()行，“计数”按钮运行word_count()方法。

代码如下所示：

from tkinter import *
from easygui import fileopenbox

root = Tk()
root.title("Word Counter")
root.geometry("500x500")

app = Frame(root)
app.grid()
button1 = Button(app, text = "Browse for a file")
button1.grid()

button2 = Button(app)
button2.grid()
button2.configure(text ="Count the file")

button3 = Button(app)
button3.grid()
button3["text"] = "Exit"

root.mainloop()

def word_count(filename):
    filename = fileopenbox()
    if not filename.endswith(('.txt', '.py', '.java')):
        print('Are you trying to annoy me? How about giving me a TEXT or SOURCE CODE file, genius?')
        return

    with open(filename) as f:
        n_lines = 0
        n_words = 0
        for line in f:
            n_lines += 1
            n_words += len(line.split())
    print('Your file has {} lines, and {} words'.format(n_lines, n_words))

Answer 1

您必须将对要执行的函数的引用作为command选项传递。由于你分两个步骤来分配任务（一个按钮要求文件名，另一个按钮来计算行和单词），我建议你创建一个包装所有内容的类。

此外，我建议您删除easygui的依赖项 - 因为它是一个不再维护的项目 - 并将其替换为filedialog.askopenfilename，它是标准库的一部分：

from tkinter import *
from tkinter.filedialog import askopenfilename
from tkinter.messagebox import showwarning, showinfo


class App(Frame):
    def __init__(self, master):
        Frame.__init__(self, master)
        self.filename = None
        button1 = Button(self, text="Browse for a file", command=self.askfilename)
        button2 = Button(self, text ="Count the file", command=self.word_count)
        button3 = Button(self, text="Exit", command=master.destroy)
        button1.grid()
        button2.grid()
        button3.grid()
        self.grid()
    def askfilename(self):
        filename = askopenfilename()
        if not filename.endswith(('.txt', '.py', '.java')):
            showwarning('Are you trying to annoy me?', 'How about giving me a TEXT or SOURCE CODE file, genius?')
        else:
            self.filename = filename
    def word_count(self):
        if self.filename:
            with open(self.filename) as f:
                n_lines = 0
                n_words = 0
                for line in f:
                    n_lines += 1
                    n_words += len(line.split())
            showinfo('Result', 'Your file has {} lines, and {} words'.format(n_lines, n_words))
        else:
            showwarning('No file selected', 'Select a file first')


root = Tk()
root.title("Word Counter")
root.geometry("500x500")
app = App(root)
root.mainloop()

如何使按钮调用功能

1 个答案: