Sort list using every second element

I have a list as following:

['Pizza', '1', 'Apple', 2, 'Pizza', '1', 'Orange', '5', 'Pear', '4']

And I want to sort it according to every second element in the list, so the output would be the following:

[‘Pizza’, ‘1’, ‘Pizza’, ‘1’, ‘Apple’, 2, ‘Pear’, ‘4’, ‘Orange’, ‘5’]

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How can I do this?

>Solution :

group the list into tuples:

mylist = ['Pizza', '1', 'Apple', 2, 'Pizza', '1', 'Orange', '5', 'Pear', '4']
grouped_list = [(k, v) for k, v, in zip(mylist[::2], mylist[1::2])]

sort them by value:

sorted_list = sorted(grouped_list, key=lambda x:x[1])

gives:

[('Pizza', 1), ('Pizza', 1), ('Apple', 2), ('Pear', 4), ('Orange', 5)]

back into a list:

sum([[k, v] for k, v in sorted_list], [])