# 10 examples of 'sort list of lists by first element python' 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``
``22def Quick_Sort(list):23    Quick(list, 0, len(list) - 1)``
``23def qsort(lst):24    """Return a sorted copy of the input list.2526    Input:2728      lst : a list of elements which can be compared.2930    Examples:3132    >>> qsort([])33    []3435    >>> qsort([3,2,5])36    [2, 3, 5]37    """3839    #@ Hint: remember that all recursive functions need an exit condition40    if len(lst) <= 1:  #@41        return lst #@4243    #@ Select pivot and apply recursively44    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 ] #@4748    #@ Upon return, make sure to properly concatenate the output lists49    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 here9    return lst``
``909""" Contains(self: Queue[T], item: T) -> bool """910pass``
``15def SortTwoLists(primary, secondary):16    # sort two lists by order of elements of the primary list17    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)``
``27def quick_sort(myList, start, end):28    if start < end:29        # partitioning the list30        split = partition(myList, start, end)31        # split halves & sort both halves32        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 performance12    return len(list1) == len(list2) and sorted(list1) == sorted(list2)``
``14def shell_sort(collection):15    """Pure implementation of shell sort algorithm in Python16    :param collection:  Some mutable ordered collection with heterogeneous17    comparable items inside18    :return:  the same collection ordered by ascending1920    >>> shell_sort([0, 5, 3, 2, 2])21    [0, 2, 2, 3, 5]2223    >>> shell_sort([])24    []2526    >>> shell_sort([-2, -5, -45])27    [-45, -5, -2]28    """29    # Marcin Ciura's gap sequence30    gaps = [701, 301, 132, 57, 23, 10, 4, 1]3132    for gap in gaps:33        i = gap34        while i < len(collection):35            temp = collection[i]36            j = i37            while j >= gap and collection[j - gap] > temp:38                collection[j] = collection[j - gap]39                j -= gap40            collection[j] = temp41            i += 14243    return collection``