10 examples of 'python sort list of lists by first element' in Python

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70def sorted(lst, cmp=None, key=None, reverse=None):
71 "sorted(iterable, cmp=None, key=None, reverse=False) --> new sorted list"
72 sorted_lst = list(lst)
73 sorted_lst.sort(cmp, key, reverse)
74 return sorted_lst
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22def Quick_Sort(list):
23 Quick(list, 0, len(list) - 1)
23def qsort(lst):
24 """Return a sorted copy of the input list.
25
26 Input:
27
28 lst : a list of elements which can be compared.
29
30 Examples:
31
32 >>> qsort([])
33 []
34
35 >>> qsort([3,2,5])
36 [2, 3, 5]
37 """
38
39 #@ Hint: remember that all recursive functions need an exit condition
40 if len(lst) <= 1: #@
41 return lst #@
42
43 #@ Select pivot and apply recursively
44 pivot, rest = lst[0],lst[1:] #@
45 less_than = [ lt for lt in rest if lt < pivot ] #@
46 greater_equal = [ ge for ge in rest if ge >= pivot ] #@
47
48 #@ Upon return, make sure to properly concatenate the output lists
49 return qsort(less_than) + [pivot] + qsort(greater_equal) #@
5def qsort(lst):
6 """ Quick sort: returns a sorted copy of the list.
7 """
8 # Implement the quick sort logic here
9 return lst
909""" Contains(self: Queue[T], item: T) -> bool """
910pass
27def quick_sort(myList, start, end):
28 if start < end:
29 # partitioning the list
30 split = partition(myList, start, end)
31 # split halves & sort both halves
32 quick_sort(myList, start, split - 1)
33 quick_sort(myList, split + 1, end)
34 return myList
10def unordered_list_cmp(list1, list2):
11 # Check lengths first for slight improvement in performance
12 return len(list1) == len(list2) and sorted(list1) == sorted(list2)
15def SortTwoLists(primary, secondary):
16 # sort two lists by order of elements of the primary list
17 paired_sorted = sorted(zip(primary, secondary), key=lambda x: x[0])
18 return (map(list, zip(*paired_sorted))) # two lists
40def testLtSort(self):
41 self.run_test(lt_sort, self.source)
23def shell_sort(unsorted_list, add_list):
24 '''shell_sort
25 params:
26 unsorted_list: 未排序列表
27 add_list:增量列表
28 returns:
29 sorted_list:排序列表
30 '''
31 for add in add_list:
32 unsorted_list = shell_sort_once(unsorted_list, add)
33
34 return unsorted_list

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