如何从元组列表中删除项目? [英] How can I delete items from my list of tuples?

问题描述

我想使用索引列表从元组列表中删除项目:

I want to use a list of indices to remove items from my list of tuples:

mytupList = [(1,2),(2,3),(5,6),(8,9)]
indxList = [1,3]

我已经尝试过使用numpy了，

I have tried using numpy like so:

newtupList = numpy.delete(mytupList,indxList).tolist()

，但没有成功.

我希望我的newtupList = [(1,2)，(5,6)]

I want my newtupList = [(1,2),(5,6)]

我在做什么错?我也尝试过:

what am I doing wrong? I have also tried:

a = np.array(mytupList) 
newtup = np.delete((a),indxList)

但这不会产生预期的结果.

but this does not produce the desired result.

推荐答案

如

As mentioned in the docs, you need to use the axis option there, because without it being mentioned it would delete elements on a flattened version. Thus, you need to do like this -

np.delete(mytupList,indxList,axis=0).tolist()

样品运行-

In [21]: mytupList
Out[21]: [(1, 2), (2, 3), (5, 6), (8, 9)]

In [22]: indxList
Out[22]: [1, 3]

In [23]: np.delete(mytupList,indxList).tolist() # Flattens and deletes
Out[23]: [1, 2, 5, 6, 8, 9]

In [24]: np.delete(mytupList,indxList,axis=0).tolist() # Correct usage
Out[24]: [[1, 2], [5, 6]]

---

要保留元组列表的格式，请使用 map 删除后，就像这样-

---

To retain the format of list of tuples, use map after deleting, like so -

map(tuple,np.delete(mytupList,indxList,axis=0))

样品运行-

In [16]: map(tuple,np.delete(mytupList,indxList,axis=0))
Out[16]: [(1, 2), (5, 6)]

这篇关于如何从元组列表中删除项目?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！