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Python: Convert all the characters in uppercase and lowercase and eliminate duplicate letters from a sequence

Python map: Exercise-6 with Solution

Write a Python program to convert all the characters in uppercase and lowercase and eliminate duplicate letters from a given sequence. Use map() function.

Sample Solution:

Python Code :

def change_cases(s):
  return str(s).upper(), str(s).lower()
 
chrars = {'a', 'b', 'E', 'f', 'a', 'i', 'o', 'U', 'a'}
print("Original Characters:\n",chrars)
 
result = map(change_cases, chrars)
print("\nAfter converting above characters in upper and lower cases\nand eliminating duplicate letters:")
print(set(result))

Sample Output:

Original Characters:
 {'f', 'b', 'U', 'i', 'o', 'E', 'a'}

After converting above characters in upper and lower cases
and eliminating duplicate letters:
{('U', 'u'), ('O', 'o'), ('A', 'a'), ('B', 'b'), ('F', 'f'), ('I', 'i'), ('E', 'e')}

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