Question

How to sort a list of tuples by multiple columns in Python

Answer 1

lst_tuples = [
   (7, 2, 'python'),
   (8, 3, 'c'),
   (3, 5, 'c++'),
   (4, 1, 'c#'),
   (3, 2, 'java'),
   (7, 1, 'go'),
   (1, 2, 'rust'),
]

# Sort by column 0, then by column 1
sorted_lst_tuples = sorted(lst_tuples, key=lambda x: (x[0], x[1]))  

for element in sorted_lst_tuples:
   print(element)
 

 
'''
run:
 
(1, 2, 'rust')
(3, 2, 'java')
(3, 5, 'c++')
(4, 1, 'c#')
(7, 1, 'go')
(7, 2, 'python')
(8, 3, 'c')
 
'''

 

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Answer 2

from operator import itemgetter

lst_tuples = [
   (7, 2, 'python'),
   (8, 3, 'c'),
   (3, 5, 'c++'),
   (4, 1, 'c#'),
   (3, 2, 'java'),
   (7, 1, 'go'),
   (1, 2, 'rust'),
]

# Sort by column 0, then by column 1
sorted_lst_tuples = sorted(lst_tuples, key=itemgetter(0, 1))

for element in sorted_lst_tuples:
   print(element)
 

 
'''
run:
 
(1, 2, 'rust')
(3, 2, 'java')
(3, 5, 'c++')
(4, 1, 'c#')
(7, 1, 'go')
(7, 2, 'python')
(8, 3, 'c')
 
'''

 

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