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Python: reversed() function

reversed() function

The reversed() function is used to get a reverse iterator.

Version:

(Python 3.2.5)

Syntax:

reversed(seq)

Parameter:

Name Description Required /
Optional
seq Any iterable object Required

Return value:

An iterator in reverse order.

Example: Python reversed() function 

# for string
seqStr = 'Exercise'
print(list(reversed(seqStr)))

# for tuple
seqTup = ('P', 'y', 't', 'h', 'o', 'n')
print(list(reversed(seqTup)))

# for range
seqRan = range(2, 12)
print(list(reversed(seqRan)))

# for list
seqList = [1, 2, 4, 3, 5, 6]
print(list(reversed(seqList)))

Output:

['e', 's', 'i', 'c', 'r', 'e', 'x', 'E']
['n', 'o', 'h', 't', 'y', 'P']
[11, 10, 9, 8, 7, 6, 5, 4, 3, 2]
[6, 5, 3, 4, 2, 1]

Pictorial Presentation:

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

Pictorial Presentation:

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

Python Code Editor:

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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