Difference Between ‘+’ and ‘append’ in Python
Using ‘+’ operator to add an element in the list in Python:
Example:
sample_list =[] n = 10 for i in range(n): # i refers to new element sample_list = sample_list+[i] print(sample_list) |
Output:
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
- The ‘+’ operator refers to the accessor method and does not modify the original list.
- In this, sample_list doesn’t change itself. This type of addition of element in sample_list creates a new list from the elements in the two lists.
- The assignment of sample_list to this new list updates PythonList object so it now refers to the new list.
Complexity to add n elements
Using .append() method i.e. an efficient approach:
Example:
sample_list =[] n = 10 for i in range(n): # i refers to new element sample_list.append(i) print(sample_list) |
Output:
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
1+.....(n-2) times...+1=O(n)
Note:
.append()
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