基于python中的值提取元组

Question

我有一个元组列表，其格式如下（“key”，“value”），我需要提取最高和最高的键。第二高的价值和存储它们，我如何在python中实现这一点？

Answer 1

使用heaq.nlargest：

import heapq
heapq.nlargest(2, list_of_t, key=lambda x:x[1])

<强>演示：

>>> import heapq
>>> list_of_t = [('a', 100), ('b', 5), ('c', 50)]
>>> heapq.nlargest(2, list_of_t, key=lambda x:x[1])
[('a', 100), ('c', 50)]

Answer 2

试试这个：

# initial data
tuples = [("First", 20), ("Second", 10), ("Third", 30)]

# sort by value and reverse it
sorted_tuples = sorted(tuples, key=lambda tuple: tuple[1])[::-1]

# show result
print(sorted_tuples[0])
print(sorted_tuples[1])

# results:
#
# ('Third', 30)
# ('First', 20)