如何使用 Python tkSimpleDialog.askstring
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How to use Python tkSimpleDialog.askstring
提问by d-cubed
I want to use the response from an askstring prompt to set a variable. Unfortunately, I have the dilemma that I'm trapped in the loop asking the question or the window refuses to draw because the variable (urltoopen) has no value. The code as it stands:
我想使用来自 askstring 提示的响应来设置变量。不幸的是，我遇到了困境，我被困在问问题的循环中，或者窗口拒绝绘制，因为变量 (urltoopen) 没有值。代码如下：
urltoopen = tkSimpleDialog.askstring('Address', 'Where do we get the pictures from?')
usock = urllib2.urlopen(urltoopen)
data = usock.read()
usock.close()
采纳答案by Alex Martelli
tkSimpleDialog.askstringreturns Noneif the user clicks Cancel or closes the window (instead of clicking Ok or using the Enter key); you should check for that (what do you want to do if the user chooses to cancel? surely not call urlopenanyway...).
None如果用户单击取消或关闭窗口（而不是单击确定或使用 Enter 键），则tkSimpleDialog.askstring返回；你应该检查一下（如果用户选择取消，你想做什么？当然不要打电话urlopen......）。
Apart from that, you're using the function correctly; I imagine that by "has no value" you mean is None, right?
除此之外，您正确使用了该功能；我想你的意思是“没有价值” is None，对吧？
回答by d-cubed
root = Tk()
try:
urltoopen = tkSimpleDialog.askstring('Ask Address', 'Where do we get the pictures from?')
usock = urllib2.urlopen(urltoopen)
data = usock.read()
usock.close()
a = data
except:
sys.exit()
works fine. But it does need error handling (as mentioned by Alex).
工作正常。但它确实需要错误处理（正如 Alex 所提到的）。
