When it is required to display adjacent elements in list, a method is defined that uses enumerate and a simple iteration to determine the result.
Example
Below is a demonstration of the same −
def find_adjacent_elements(my_list):
my_result = []
for index, ele in enumerate(my_list):
if index == 0:
my_result.append((None, my_list[index + 1]))
elif index == len(my_list) - 1:
my_result.append((my_list[index - 1], None))
else:
my_result.append((my_list[index - 1], my_list[index + 1]))
return my_result
my_list = [13, 37, 58, 12, 41, 25, 48, 19, 23]
print("The list is:")
print(my_list)
print("The result is :")
print(find_adjacent_elements(my_list))Output
The list is: [13, 37, 58, 12, 41, 25, 48, 19, 23] The result is : [(None, 37), (13, 58), (37, 12), (58, 41), (12, 25), (41, 48), (25, 19), (48, 23), (19, None)]
Explanation
A method named ‘find_adjacent_elements’ is defined that takes a list as a parameter, and does enumerates over the list.
An empty list is created.
The elements are iterated over using ‘enumerate’ and depending on the value of the index, the output is determined.
If index value is 0, the element in first index is appended to the empty list.
If index is equal to length of list minus 1, the element in previous index is appended to empty list.
Otherwise, both the previous and next elements are appended to the empty list.
Outside the method, a list is defined and displayed on the console.
The method is called by passing the required parameter.
The output is displayed on the console.