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Python: Merge some list items in given list using index value

Python List: Exercise - 173 with Solution

Write a Python program to merge some list items in given list using index value.

Sample Solution:

Python Code:

def merge_some_chars(lst,merge_from,merge_to):
    result = lst
    result[merge_from:merge_to] = [''.join(result[merge_from:merge_to])]    
    return result    
chars = ['a', 'b', 'c', 'd', 'e', 'f', 'g']
print("Original lists:")
print(chars)
merge_from = 2
merge_to = 4
print("\nMerge items from",merge_from,"to",merge_to,"in the said List:")
print(merge_some_chars(chars,merge_from,merge_to))
chars = ['a', 'b', 'c', 'd', 'e', 'f', 'g']
merge_from = 3
merge_to = 7
print("\nMerge items from",merge_from,"to",merge_to,"in the said List:")
print(merge_some_chars(chars,merge_from,merge_to))

Sample Output:

Original lists:
['a', 'b', 'c', 'd', 'e', 'f', 'g']

Merge items from 2 to 4 in the said List:
['a', 'b', 'cd', 'e', 'f', 'g']

Merge items from 3 to 7 in the said List:
['a', 'b', 'c', 'defg']

Pictorial Presentation:

Python List: Merge some list items in given list using index value.

Flowchart:

Flowchart: Merge some list items in given list using index value.

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Previous: Write a Python program to remove the last N number of elements from a given list.
Next: Write a Python program to add a number to each element in a given list of numbers.

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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