小编cod*_*kid的帖子

我正在创建一个设置窗口，但无法弄清楚如何为单选按钮设置默认值。我希望窗口以选中的黑色开头，如果用户未单击任一按钮，则仍将返回“ B”值。谢谢您的帮助。

import tkinter
from tkinter import ttk 

class Test:
    def __init__(self):
        self.root_window = tkinter.Tk()

        #create who goes first variable
        self.who_goes_first = tkinter.StringVar()

        #black radio button
        self._who_goes_first_radiobutton = ttk.Radiobutton(
            self.root_window,
            text = 'Black',
            variable = self.who_goes_first,
            value = 'B')    
        self._who_goes_first_radiobutton.grid(row=0, column=1)

        #white radio button
        self._who_goes_first_radiobutton = ttk.Radiobutton(
            self.root_window,
            text = 'White',
            variable = self.who_goes_first,
            value = 'W')    
        self._who_goes_first_radiobutton.grid(row=1, column=1)

    def start(self) -> None:
        self.root_window.mainloop()

if __name__ == '__main__':

    game = Test()
    game.start()

我正在学习 lldb，我很好奇你如何为更大的数据结构（例如向量）设置观察点。我知道我可以使用打印并且可以工作，但我收到一条消息说不支持大小为“x”的观察点。有没有解决的办法？谢谢您的帮助！

(lldb) s
Process 36110 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = step in
    frame #0: 0x0000000100001600 a.out`main at test.cpp:10
   7        vector<int> arr;
   8        arr.push_back(1);
   9        arr.push_back(2);
-> 10       arr.push_back(3);
   11       arr.push_back(4);
   12       arr.push_back(5);
   13
Target 0: (a.out) stopped.
(lldb) print arr
(std::__1::vector<int, std::__1::allocator<int> >) $2 = size=2 {
  [0] = 1
  [1] = 2
}
(lldb) w s v arr
error: Watchpoint creation failed (addr=0x7ffeefbff458, size=24, variable expression='arr').
error: watch size of 24 is not …

如果您对多个值进行相同的比较，是否有一种速记方法可以在 if 语句中编写比较。只是好奇是否有可能发生这样的事情。谢谢您的帮助！

a =1
b =1
c =1

if a == 1 and b ==1 and c == 1:
    print('yes')

# It would be nice if you could do this or something like it.
if a,b,c == 1:
    print('this would be easier')

我很好奇是否有办法使用vim一次用引号将多个单词引起来。我正在使用tpope环绕声并重复播放，但我想知道是否有类似的命令

3ysw"

所以从

one two three 

至

"one" "two" "three"