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Python – List Elements Grouping in Matrix
When it is required to list elements grouping in a matrix, a simple iteration, the ‘pop’ method, list comprehension and ‘append’ methods are used.
Example
Below is a demonstration of the same −
my_list = [[14, 62], [51, 23], [12, 62], [78, 87], [41, 14]]
print("The list is :")
print(my_list)
check_list = [14, 12, 41, 62]
print("The list is :")
print(check_list)
my_result = []
while my_list:
sub_list_1 = my_list.pop()
sub_list_2 = [element for element in check_list if element not in sub_list_1]
try:
my_list.remove(sub_list_2)
my_result.append([sub_list_1, sub_list_2])
except ValueError:
my_result.append(sub_list_1)
print("The result is :")
print(my_result)Output
The list is : [[14, 62], [51, 23], [12, 62], [78, 87], [41, 14]] The list is : [14, 12, 41, 62] The result is : [[[41, 14], [12, 62]], [78, 87], [51, 23], [14, 62]]
Explanation
A list of list of integers is defined and is displayed on the console.
Another list of integers is defined and displayed on the console.
An empty list is defined.
A simple iteration is used, and the top most element is popped using ‘pop’ method.
This is assigned to a variable ‘sub_list_1’.
A list comprehension is used to iterate over the second list, and check if element is not there in ‘sub_list_1’.
The ‘try’ and ‘except’ block is used to append specific elements to the empty list.
This list is displayed as the output on the console.
Updated on: 08-Sep-2021
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