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Python: sorted() function

sorted() function

The sorted() function is used to get a new sorted list from the items in iterable.

Version:

(Python 3.2.5)

Syntax:

sorted(iterable[, key][, reverse])

Parameter:

Name Description Required /
Optional
iterable

The sequence to sort list, dictionary, tuple or collection etc.

 Required.
key A function that serves as a key for the sort comparison. Optional.
reverse True will sort descending and default is False Optional.

Return value:

A sorted list from the given iterable.

Example-1: Python sorted() function

# vowels list
pyList = ['a', 'e', 'i', 'o', 'u']
print(sorted(pyList))

# string 
pyStr = 'Python'
print(sorted(pyStr))

# vowels tuple
pyTuple = ('a', 'e', 'i', 'o', 'u')
print(sorted(pyTuple))

Output:

['a', 'e', 'i', 'o', 'u']
['P', 'h', 'n', 'o', 't', 'y']
['a', 'e', 'i', 'o', 'u']

Pictorial Presentation:

Python: Built-in-function - sorted() function

Pictorial Presentation:

Python: Built-in-function - sorted() function

Example-2: Python sorted() with key function

# take third element for sort
def takeThird(elem):
    return elem[1]

# random list
random = [(2, 2), (3, 4), (4, 1), (1, 3)]

# sort list with key
sortList = sorted(random, key=takeThird)

# print list
print('Sorted list:', sortList)

Output:

Sorted list: [(4, 1), (2, 2), (1, 3), (3, 4)]

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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