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Python: Change a given string to a new string where the first and last chars have been exchanged

Python String: Exercise-10 with Solution

Write a Python program to change a given string to a new string where the first and last chars have been exchanged.

Python String Exercises: Change a given string to a new string where the first and last chars have been exchanged

Sample Solution:-

Python Code:

def change_sring(str1):
      return str1[-1:] + str1[1:-1] + str1[:1]
	  
print(change_sring('abcd'))
print(change_sring('12345'))

Sample Output: 

dbca                                                                                                          
52341

Flowchart:

Flowchart: Change a given string to a new string where the first and last chars have been exchanged

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Next: Write a Python program to remove the characters which have odd index values of a given string.

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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