从元组列表中查找最大值的所有出现？

Question

I have a list of tuples such as:

list1=[(1,1),(2,1),(3,1),(4,0),(5,0)]

I have found the maximum element using:

max_value = max(list1, key=itemgetter(1))

This outputs: (1, 1)

I want some thing like: [(1,1),(2,1),(3,1)]

Answer 1

From Docs of max() :

If multiple items are maximal, the function returns the first one encountered. This is consistent with other sort-stability preserving tools such as sorted(iterable, key=keyfunc, reverse=True)[0] and heapq.nlargest(1, iterable, key=keyfunc).

You could select all those values that match the max_value using list comprehension

max_value = max(list1, key=itemgetter(1))[1]
ans = [y for y in list1 if y[1] == max_value]

[(1, 1), (2, 1), (3, 1)]