小编vic*_*icd的帖子

我对以下三种模式感到困惑,有人会更详细地解释它吗？

## IPython with Python 2.7.3
In [62]: re.findall(r'[a-z]*',"f233op")
Out[62]: ['f', '', '', '', 'op', '']  ## why does the last '' come out?

In [63]: re.findall(r'([a-z])*',"f233op")
Out[63]: ['f', '', '', '', 'p', '']  ## why does the character 'o' get lost?

In [64]: re.findall(r'([a-z]*)',"f233op")
Out[64]: ['f', '', '', '', 'op', '']  ## what's the different than line 63 above?

我有一个问题,为什么在我的测试代码中没有调用"windowClosed"方法如下,

import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;

public class Tmp {

    class TFrame extends JFrame{
        private static final long serialVersionUID = -5729542298504858399L;

        public TFrame() {
            setTitle("title");
            setSize(300, 300);
        }
    }


    public static void main(String[] args) {
        final TFrame t = new Tmp().new TFrame();
        t.addWindowStateListener(new WindowAdapter() {
            @Override
            public void windowStateChanged(WindowEvent e) {
                super.windowStateChanged(e);
                System.out.println(e.getOldState() + "<-old new->" + e.getNewState());
            }
        });
        t.addWindowListener(new WindowAdapter() {

            @Override
            public void windowClosed(WindowEvent e) {
                super.windowClosed(e);
                System.out.println(e.getID() + "closed " + e.getNewState());
            }

            @Override
            public …

我正在使用Python 2.7.4和Tkinter的新功能,我坚持使用以下代码.我生成了一个事件"test"并使用字符串设置"data"选项,但是从事件中检索它时发生了错误.

错误 - > AttributeError:事件实例没有属性'data'

from Tkinter import *

def handle_it(event):
    # print "event handler"
    print event.data

root = Tk()
root.after(1, lambda: root.event_generate('<<test>>', data="hi there"))
root.bind('<<test>>', handle_it)
root.mainloop()

我找不到这个案例的相关Python文档,所以我在下面提到了tcl文档 http://www.tcl.tk/man/tcl8.5/TkCmd/event.htm#M14

Python 2.7的TKinter是否支持"数据"选项？谢谢!