Python: Remove the specific item from a given list of lists

Last update on May 28 2022 13:48:56 (UTC/GMT +8 hours)

Python List: Exercise - 140 with Solution

Write a Python program to remove the specific item from a given list of lists.

Sample Solution:

Python Code:

import copy	
def remove_list_of_lists(color, N):
    for x in color:
        del x[N]
    return color

nums = [
        ["Red","Maroon","Yellow","Olive"],
        ["#FF0000", "#800000", "#FFFF00", "#808000"],
        ["rgb(255,0,0)","rgb(128,0,0)","rgb(255,255,0)","rgb(128,128,0)"]
       ]
nums1 =  copy.deepcopy(nums)
nums2 =  copy.deepcopy(nums)
nums3 =  copy.deepcopy(nums)

print("Original list of lists:")
print(nums)
N = 0
print("\nRemove 1st item from the said list of lists:")
print(remove_list_of_lists(nums1, N))
N = 1
print("\nRemove 2nd item from the said list of lists:")
print(remove_list_of_lists(nums2, N))
N = 3
print("\nRemove 4th item from the said list of lists:")
print(remove_list_of_lists(nums3, N))

Sample Output:

Original list of lists:
[['Red', 'Maroon', 'Yellow', 'Olive'], ['#FF0000', '#800000', '#FFFF00', '#808000'], ['rgb(255,0,0)', 'rgb(128,0,0)', 'rgb(255,255,0)', 'rgb(128,128,0)']]

Remove 1st item from the said list of lists:
[['Maroon', 'Yellow', 'Olive'], ['#800000', '#FFFF00', '#808000'], ['rgb(128,0,0)', 'rgb(255,255,0)', 'rgb(128,128,0)']]

Remove 2nd item from the said list of lists:
[['Red', 'Yellow', 'Olive'], ['#FF0000', '#FFFF00', '#808000'], ['rgb(255,0,0)', 'rgb(255,255,0)', 'rgb(128,128,0)']]

Remove 4th item from the said list of lists:
[['Red', 'Maroon', 'Yellow'], ['#FF0000', '#800000', '#FFFF00'], ['rgb(255,0,0)', 'rgb(128,0,0)', 'rgb(255,255,0)']]

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Next: Write a Python program to remove empty lists from a given list of lists.

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