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Python: Reverse a given list of lists

Python List: Exercise - 150 with Solution

Write a Python program to reverse a given list of lists.

Sample Solution:

Python Code:

def reverse_list_of_lists(list1):
    return list1[::-1]
colors = [['orange', 'red'], ['green', 'blue'], ['white', 'black', 'pink']]
print("Original list:")
print(colors)
print("\nReverse said list of lists:")
print(reverse_list_of_lists(colors))
nums = [[1,2,3,4], [0,2,4,5], [2,3,4,2,4]]
print("\nOriginal list:")
print(nums)
print("\nReverse said list of lists:")
print(reverse_list_of_lists(nums))

Sample Output:

Original list:
[['orange', 'red'], ['green', 'blue'], ['white', 'black', 'pink']]

Reverse said list of lists:
[['white', 'black', 'pink'], ['green', 'blue'], ['orange', 'red']]

Original list:
[[1, 2, 3, 4], [0, 2, 4, 5], [2, 3, 4, 2, 4]]

Reverse said list of lists:
[[2, 3, 4, 2, 4], [0, 2, 4, 5], [1, 2, 3, 4]]

Flowchart:

Flowchart: Reverse a given list of lists.

Visualize Python code execution:

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Python Code Editor:

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Previous: Write a Python program to get all possible combinations of the elements of a given list.
Next: Write a Python program to find the maximum and minimum values in a given list within specified index range.

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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