从列表中删除元组中的空列表答案

【问题标题】：Delete empty lists from tuple from inside a list从列表中删除元组中的空列表
【发布时间】：2021-01-27 05:54:42
【问题描述】：

我有一个元组列表，其中又包含 2 个元素和一个列表。我希望删除具有空列表的元组。

l = [('Receipt total', []), ('Total Amount (AED)', []), ('Grand total', []), ('Net Amount', []), ('Total Amount', ['593.52']), ('Net total ', []), ('Total', []), ('Gross Amount', []), ('Total Bill (AED)', []), ('Total AED', []), ('Net total in AED', []), ('Total (AED)', []), ('Total Invoice Amount', []), ('Invoice total', []), ('Amount Due', []), ('Grand Total (AED)', []), ('Total Amount Payable', []), ('Net Amt', []), ('Before Total', [('28.26\n', '28.26\n')]

预期输出：

l = [('Total Amount', ['593.52']), ('Before Total', [('28.26\n', '28.26\n')]

我试过了：

l = [t for t in i if t != [] for i in l]

它给我一个Memory Error

【问题讨论】：

元组是不可变的；您将不得不创建过滤副本！（标题具有误导性！）
[t for t in l if t[1]]
@anurag 我不明白为什么要改变元组。
@anurag 永远不要相信兔子和标题！

标签： python python-3.x list tuples

【解决方案1】：

一种使用list理解解包的方法：

[(i, j) for i, j in l if j]

输出：

[('Total Amount', ['593.52']), ('Before Total', [('28.26\n', '28.26\n')])]

【讨论】：

【解决方案2】：

您的输入有问题，对于解决方案，您可以简单地执行以下操作：

l = [('Receipt total', []), ('Total Amount (AED)', []), ('Grand total', []), ('Net Amount', []), ('Total Amount', ['593.52']), ('Net total ', []), ('Total', []), ('Gross Amount', []), ('Total Bill (AED)', []), ('Total AED', []), ('Net total in AED', []), ('Total (AED)', []), ('Total Invoice Amount', []), ('Invoice total', []), ('Amount Due', []), ('Grand Total (AED)', []), ('Total Amount Payable', []), ('Net Amt', []), ('Before Total', [('28.26\n', '28.26\n')])]

l = [i for i in l if i[1]]
print(l)

【讨论】：