知识问答

Python列表按降序排序

内容 隐藏
问题：Python列表按降序排序
回答 0
回答 1
回答 2
回答 3
回答 4
回答 5

问题：Python列表按降序排序

如何按降序对列表进行排序？

timestamp = [
    "2010-04-20 10:07:30",
    "2010-04-20 10:07:38",
    "2010-04-20 10:07:52",
    "2010-04-20 10:08:22",
    "2010-04-20 10:08:22",
    "2010-04-20 10:09:46",
    "2010-04-20 10:10:37",
    "2010-04-20 10:10:58",
    "2010-04-20 10:11:50",
    "2010-04-20 10:12:13",
    "2010-04-20 10:12:13",
    "2010-04-20 10:25:38"
]
点击查看英文原文

How can I sort this list in descending order?

timestamp = [
    "2010-04-20 10:07:30",
    "2010-04-20 10:07:38",
    "2010-04-20 10:07:52",
    "2010-04-20 10:08:22",
    "2010-04-20 10:08:22",
    "2010-04-20 10:09:46",
    "2010-04-20 10:10:37",
    "2010-04-20 10:10:58",
    "2010-04-20 10:11:50",
    "2010-04-20 10:12:13",
    "2010-04-20 10:12:13",
    "2010-04-20 10:25:38"
]

回答 0

在一行中，使用lambda：

timestamp.sort(key=lambda x: time.strptime(x, '%Y-%m-%d %H:%M:%S')[0:6], reverse=True)

将函数传递给list.sort：

def foo(x):
    return time.strptime(x, '%Y-%m-%d %H:%M:%S')[0:6]

timestamp.sort(key=foo, reverse=True)
点击查看英文原文

In one line, using a lambda:

timestamp.sort(key=lambda x: time.strptime(x, '%Y-%m-%d %H:%M:%S')[0:6], reverse=True)

Passing a function to list.sort:

def foo(x):
    return time.strptime(x, '%Y-%m-%d %H:%M:%S')[0:6]

timestamp.sort(key=foo, reverse=True)

回答 1

这将为您提供阵列的排序版本。

sorted(timestamp, reverse=True)

如果要就地排序：

timestamp.sort(reverse=True)
点击查看英文原文

This will give you a sorted version of the array.

sorted(timestamp, reverse=True)

If you want to sort in-place:

timestamp.sort(reverse=True)

回答 2

您可以简单地做到这一点：

timestamp.sort(reverse=True)
点击查看英文原文

You can simply do this:

timestamp.sort(reverse=True)

回答 3

由于您的列表已经按升序排列，因此我们可以简单地反转列表。

>>> timestamp.reverse()
>>> timestamp
['2010-04-20 10:25:38', 
'2010-04-20 10:12:13', 
'2010-04-20 10:12:13', 
'2010-04-20 10:11:50', 
'2010-04-20 10:10:58', 
'2010-04-20 10:10:37', 
'2010-04-20 10:09:46', 
'2010-04-20 10:08:22',
'2010-04-20 10:08:22', 
'2010-04-20 10:07:52', 
'2010-04-20 10:07:38', 
'2010-04-20 10:07:30']
点击查看英文原文

Since your list is already in ascending order, we can simply reverse the list.

>>> timestamp.reverse()
>>> timestamp
['2010-04-20 10:25:38', 
'2010-04-20 10:12:13', 
'2010-04-20 10:12:13', 
'2010-04-20 10:11:50', 
'2010-04-20 10:10:58', 
'2010-04-20 10:10:37', 
'2010-04-20 10:09:46', 
'2010-04-20 10:08:22',
'2010-04-20 10:08:22', 
'2010-04-20 10:07:52', 
'2010-04-20 10:07:38', 
'2010-04-20 10:07:30']

回答 4

您简单的输入：

timestamp.sort()
timestamp=timestamp[::-1]
点击查看英文原文

you simple type:

timestamp.sort()
timestamp=timestamp[::-1]

回答 5

这是另一种方式


timestamp.sort()
timestamp.reverse()
print(timestamp)
点击查看英文原文

Here is another way


timestamp.sort()
timestamp.reverse()
print(timestamp)