Python list items can be sorted using the sort() method in specified orders including reverse order.

Sort the list alphabetically:

my_list = ["Lamborghini", "Ferrari", "Maserati", "Alfa Romeo"]

my_list.sort()
print(my_list) #['Alfa Romeo', 'Ferrari', 'Lamborghini', 'Maserati']

Sort the list numerically:

my_list = [100, 8, 77, 4, -5]

my_list.sort()
print(my_list) #[-5, 4, 8, 77, 100]

By default the sort() method is case sensitive, resulting in all capital letters being sorted before lower case letters.

my_list = ["Lamborghini", "ferrari", "Maserati", "Alfa Romeo"]

my_list.sort()
print(my_list) #['Alfa Romeo', 'Lamborghini', 'Maserati', 'ferrari']

If you want a case-insensitive sort function, use str.lower as a key function.

my_list = ["Lamborghini", "ferrari", "Maserati", "Alfa Romeo"]

my_list.sort(key = str.lower)
print(my_list) #['Alfa Romeo', 'ferrari', 'Lamborghini', 'Maserati']

To sort descending, use the keyword argument reverse = True.

my_list = ["Lamborghini", "Ferrari", "Maserati", "Alfa Romeo"]

my_list.sort(reverse = True)
print(my_list) #['Maserati', 'Lamborghini', 'Ferrari', 'Alfa Romeo']

If you want to reverse the order of a list, regardless of the alphabet, the reverse() method reverses the current sorting order of the elements.

my_list = ["Lamborghini", "Ferrari", "Maserati", "Alfa Romeo"]

my_list.reverse()
print(my_list) #['Alfa Romeo', 'Maserati', 'Ferrari', 'Lamborghini']

You can also customize your sort function by using the keyword argument key = function, which will return a number that will be used to sort the list lowest to highest.

def myfunc(n):
    return abs(n - 20)

my_list = [100, 70, 45, 28, 45]
my_list.sort(key = myfunc)

print(my_list) #[28, 45, 45, 70, 100]

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