像C++ sort(),Java sort()和其他语言一样,python还提供了内置的函数进行排序。
排序函数可用于按升序和降序对列表进行排序。
以升序对列表进行排序。
用法
List_name.sort() This will sort the given list in ascending order.
此函数可用于对整数,浮点数,字符串等列表进行排序。
# List of Integers
numbers = [1, 3, 4, 2]
# Sorting list of Integers
numbers.sort()
print(numbers)
# List of Floating point numbers
decimalnumber = [2.01, 2.00, 3.67, 3.28, 1.68]
# Sorting list of Floating point numbers
decimalnumber.sort()
print(decimalnumber)
# List of strings
words = ["Geeks", "For", "Geeks"]
# Sorting list of strings
words.sort()
print(words)
输出:
[1, 2, 3, 4] [1.68, 2.0, 2.01, 3.28, 3.67] ['For', 'Geeks', 'Geeks']
以降序对列表进行排序。
用法
list_name.sort(reverse=True) This will sort the given list in descending order.
# List of Integers
numbers = [1, 3, 4, 2]
# Sorting list of Integers
numbers.sort(reverse=True)
print(numbers)
# List of Floating point numbers
decimalnumber = [2.01, 2.00, 3.67, 3.28, 1.68]
# Sorting list of Floating point numbers
decimalnumber.sort(reverse=True)
print(decimalnumber)
# List of strings
words = ["Geeks", "For", "Geeks"]
# Sorting list of strings
words.sort(reverse=True)
print(words)
输出:
[4, 3, 2, 1] [3.67, 3.28, 2.01, 2.0, 1.68] ['Geeks', 'Geeks', 'For']
用法:
list_name.sort() - it sorts in ascending order
list_name.sort(reverse=True) - it sorts in descending order
list_name.sort(key=…, reverse=…) - it sorts according to user’s choice
参数:
默认情况下,sort()不需要任何其他参数。但是,它有两个可选参数:
- reverse -如果为true,则列表按降序排序
key -用作排序比较键的函数
返回值:
It returns a sorted list according to the passed parameter.
# Python program to demonstrate sorting by user's
# choice
# function to return the second element of the
# two elements passed as the parameter
def sortSecond(val):
return val[1]
# list1 to demonstrate the use of sorting
# using using second key
list1 = [(1,2),(3,3),(1,1)]
# sorts the array in ascending according to
# second element
list1.sort(key=sortSecond)
print(list1)
# sorts the array in descending according to
# second element
list1.sort(key=sortSecond,reverse=True)
print(list1)
输出:
[(1, 1), (1, 2), (3, 3)] [(3, 3), (1, 2), (1, 1)]
感谢奋斗者在此主题上的投入。
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注:本文由纯净天空筛选整理自ShivamKD大神的英文原创作品 sort() in Python。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。