是否可以在不创建不需要的变量的情况下在 Python 中解压缩元组?

2022-01-20 00:00:00 python tuples iterable-unpacking

问题描述

有没有办法编写以下函数，以便我的 IDE 不会抱怨 column 是未使用的变量?

Is there a way to write the following function so that my IDE doesn't complain that column is an unused variable? 

def get_selected_index(self):
    (path, column) = self._tree_view.get_cursor()
    return path[0]

在这种情况下，我不关心元组中的第二项，只想在解包时丢弃对它的引用.

In this case I don't care about the second item in the tuple and just want to discard the reference to it when it is unpacked.

解决方案

在 Python 中，_ 通常用作被忽略的占位符.

In Python the _ is often used as an ignored placeholder.

(path, _) = self._treeView.get_cursor()

您也可以避免解包，因为元组是可索引的.

You could also avoid unpacking as a tuple is indexable.

def get_selected_index(self):
    return self._treeView.get_cursor()[0][0]

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