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Python: Remove the last N number of elements from a given list

Python List: Exercise - 172 with Solution

Write a Python program to remove the last N number of elements from a given list.

Sample Solution:

Python Code:

def remove_last_n(nums, N):
    result = nums[:len(nums)-N]
    return result    
nums = [2,3,9,8,2,0,39,84,2,2,34,2,34,5,3,5]
print("Original lists:")
print(nums)
N = 3
print("\nRemove the last",N,"elements from the said list:")
print(remove_last_n(nums, N))
N = 5
print("\nRemove the last",N,"elements from the said list:")
print(remove_last_n(nums, N))
N = 1
print("\nRemove the last",N,"element from the said list:")
print(remove_last_n(nums, N))

Sample Output:

Original lists:
[2, 3, 9, 8, 2, 0, 39, 84, 2, 2, 34, 2, 34, 5, 3, 5]

Remove the last 3 elements from the said list:
[2, 3, 9, 8, 2, 0, 39, 84, 2, 2, 34, 2, 34]

Remove the last 5 elements from the said list:
[2, 3, 9, 8, 2, 0, 39, 84, 2, 2, 34]

Remove the last 1 element from the said list:
[2, 3, 9, 8, 2, 0, 39, 84, 2, 2, 34, 2, 34, 5, 3]

Pictorial Presentation:

Python List: Remove the last N number of elements from a given list.

Flowchart:

Flowchart: Remove the last N number of elements from a given list.

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Python Code Editor:

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

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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