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Python: Sort a given list of tuples on specified element

Python List: Exercise - 188 with Solution

Write a Python program to sort a given list of tuples on specified element.

Sample Solution:

Python Code:

def sort_on_specific_item(lst, n):
    result = sorted((lst), key=lambda x: x[n])
    return result   
items = [('item2', 10, 10.12), ('item3', 15, 25.10), ('item1', 11, 24.50),('item4', 12, 22.50)]
print("Original list of tuples:")
print(items)
print("\nSort on 1st element of the tuple of the said list:")
n = 0
print(sort_on_specific_item(items, n))
print("\nSort on 2nd element of the tuple of the said list:")
n = 1
print(sort_on_specific_item(items, n))
print("\nSort on 3rd element of the tuple of the said list:")
n = 2
print(sort_on_specific_item(items, n))

Sample Output: 

Original list of tuples:
[('item2', 10, 10.12), ('item3', 15, 25.1), ('item1', 11, 24.5), ('item4', 12, 22.5)]

Sort on 1st element of the tuple of the said list:
[('item1', 11, 24.5), ('item2', 10, 10.12), ('item3', 15, 25.1), ('item4', 12, 22.5)]

Sort on 2nd element of the tuple of the said list:
[('item2', 10, 10.12), ('item1', 11, 24.5), ('item4', 12, 22.5), ('item3', 15, 25.1)]

Sort on 3rd element of the tuple of the said list:
[('item2', 10, 10.12), ('item4', 12, 22.5), ('item1', 11, 24.5), ('item3', 15, 25.1)]

Pictorial Presentation:

Python List: Sort a given list of tuples on specified element.

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Flowchart: Sort a given list of tuples on specified element.

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Previous: Write a Python program to convert a given list of tuples to a list of strings.
Next: Write a Python program to shift last element to first position and first element to last position in a given list.

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m