set of tuples sort by first element python code example

Example 1: sort tuple by first element python

a = [(5,8), (3,4), (9,7)]

#sort by first element in tuple
result = sorted(a, key=lambda tup: tup[0])

#OR to do inplace sort:

a.sorted(key = lambda tup: tup[0])

# output
[(3, 4), (5, 8), (9, 7)]

Example 2: how to sort a list by the second element in tuple python

# lists_of_tuples = [('item', 'price'), ('item', 'price'), ('item', 'price')]
def sort_prices(list_of_tuples): #sort the list b*y the price of each tuple
    list_of_tuples.sort(key=lambda x: x[1], reverse=True) #earse the "reverse" part to sort in small to big.
    return list_of_tuples, print(list_of_tuples)

Example 3: how to sort tuples in python

# If you have a tuple, first convert it to a list:

a = (3,1,2)
a = list(a)

# And now you can just use the inbuilt function ( .sort() ):
a.sort()
print(a)
>>> [1,2,3]

# ^ by using .sort() you are modifying the original list / tuple, however
# if you want to make a sorted copy of the list / tuple, then you use this:

a = [3, 6, 8, 2, 78, 1, 23, 45, 9]
print(sorted(a))

>>> [1, 2, 3, 6, 8, 9, 23, 45, 78]

# This also works with the alphabet or a combination between letters and
# numbers.