Python – Group Consecutive elements by Sign

Python Server Side Programming Programming

When it is required to group consecutive elements by sign, the ‘^’ operator and the simple iteration along with ‘enumerate’ is used.

Below is a demonstration of the same −

Example

Live Demo

my_list = [15, -33, 12, 64, 36, -12, -31, -17, -49, 12, 43, 30, -23, -35, 53]

print("The list is :")
print(my_list)

my_result = [[]]
for (index, element) in enumerate(my_list):

   if element ^ my_list[index - 1] < 0:
      my_result.append([element])
   else:
      my_result[-1].append(element)

print("The result is :")
print(my_result)

Output

The list is :
[15, -33, 12, 64, 36, -12, -31, -17, -49, 12, 43, 30, -23, -35, 53]
The result is :
[[15], [-33], [12, 64, 36], [-12, -31, -17, -49], [12, 43, 30], [-23, -35], [53]]

Explanation

A list is defined and is displayed on the console.
An empty list of list is defined.
The list is iterated using ‘enumerate’, and the ‘^’ operator is used to check if the specific element is less than 0.
If yes, it is appended to the empty list.
Otherwise, it is appended to the end of the list.
This is displayed as the output on the console.

AmitDiwan

Published on 04-Sep-2021 11:06:54

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