从for循环中捕获变量，以供以后在QPushButton中使用 [英] Capture variable from for-loop for using later in QPushButton

问题描述

免责声明:我已经阅读过类似的其他问题(例如，此

Disclaimer: I've read other questions like this already (eg. this one) but didn't find a working solution for me yet (or I just don't understand them :))

当我在for循环中创建一个lambda来从块的范围访问数据时，由于Python捕获工作的方式，我得到一个pylint警告(cell-var-from-loop).例如:

When I create a lambda inside a for loop accessing data from the scope of the block I get a pylint warning (cell-var-from-loop) because of the way Python captures work. E.g:

for key, value in data.items():
    button = QtGui.QPushButton('show data')
    button.clicked.connect(lambda: show_data(value))
    table_widget.setCellWidget(1, 1, button)

还有更多类似的问题，但我现在仍然不知道如何系统地解决此问题.我尝试为lambda提供默认值，例如建议的此处:

There are more questions like this but I still don't now how I systematically solve this issue. I tried to provide default values to the lambda like suggested here:

for key, value in data.items():
    button = QtGui.QPushButton('show data')
    button.clicked.connect(lambda v=value: show_data(v))
    table_widget.setCellWidget(1, 1, button)

但是当我这样做时，会发生奇怪的事情-在示例中value应该是字符串，而show_data是用bool调用的.

But when I do it like this weird things happen - while value ought to be a string in my example show_data is being called with a bool.

我做错了什么吗?这种方法行得通吗?

Am I doing something totally wrong? Should this approach work?

推荐答案

点击的信号发送一个选中的参数.因此，尝试:

The clicked signal sends a checked parameter. So try:

button.clicked.connect(lambda chk, v=value: show_data(v))

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