在此程序中, 我们需要接受一个列表, 并根据其中包含的元素的长度对其进行排序。
例子:
Input : list = ["rohan", "amy", "sapna", "muhammad", "aakash", "raunak", "chinmoy"]
Output : ['amy', 'rohan', 'sapna', 'aakash', 'raunak', 'chinmoy', 'muhammad']
Input : list = [["ram", "mohan", "aman"], ["gaurav"], ["amy", "sima", "ankita", "rinku"]]
Output : [['gaurav'], ['ram', 'mohan', 'aman'], ['amy', 'sima', 'ankita', 'rinku']]
Note: The first example comprises of Strings whose
length can be calculated. The second example comprises
of sublists, which is also arranged according to there
length.
有许多方法可以执行此操作。任何人都可以使用自己的算法技术, 但是Python为我们提供了各种内置函数来执行这些算法。内置功能包括分类()和sorted()以及key参数。我们可以通过两种方式执行这些操作。一种方法是通过创建新列表对列表进行排序, 另一种方法是在给定列表内进行排序, 以节省空间。
通过创建新列表进行排序的语法为:
sorted_list = sorted(unsorted_list, key=len)
# Python code to sort a list by creating
# another list Use of sorted()
def Sorting(lst):
lst2 = sorted (lst, key = len )
return lst2
# Driver code
lst = [ "rohan" , "amy" , "sapna" , "muhammad" , "aakash" , "raunak" , "chinmoy" ]
print (Sorting(lst))
不创建新列表进行排序的语法为:
unsorted_list.sort(key=len)
# Python code to sort a list without
# creating another list Use of sort()
def Sorting(lst):
lst.sort(key = len )
return lst
# Driver code
lst = [ "rohan" , "amy" , "sapna" , "muhammad" , "aakash" , "raunak" , "chinmoy" ]
print (Sorting(lst))
输出如下:
['amy', 'rohan', 'sapna', 'aakash', 'raunak', 'chinmoy', 'muhammad']
加工:
Python在排序时实现的这些关键功能称为装饰-排序-无法装饰的设计模式。它遵循以下步骤:
- 列表中的每个元素都将临时替换为”装饰”版本, 其中包括应用于该元素的键函数的结果。
- 该列表根据键的自然顺序排序。
- 装饰元素将替换为原始元素。
通过创建新的虚拟列表进行排序的代码为:
import numpy
def Sorting(lst):
# list for storing the length of each string in list
lenlist = []
for x in lst:
lenlist.append( len (x))
# return a list with the index of the sorted
# items in the list
sortedindex = numpy.argsort(lenlist)
# creating a dummy list where we will place the
# word according to the sortedindex list
lst2 = [ 'dummy' ] * len (lst)
# print(sortedindex, lenlist)
for i in range ( len (lst)):
# placing element in the lst2 list by taking the
# value from original list lst where it should belong
# in the sorted list by taking its index from sortedindex
lst2[i] = lst[sortedindex[i]]
return lst2
# Driver code
lst = [ "rohan" , "amy" , "sapna" , "muhammad" , "aakash" , "raunak" , "chinmoy" ]
print (Sorting(lst))
输出如下:
['amy', 'rohan', 'sapna', 'aakash', 'raunak', 'chinmoy', 'muhammad']
首先, 你的面试准备可通过以下方式增强你的数据结构概念:Python DS课程。
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