List Extend –
The extend method add all the elements of a list ( or any iterable ) to the end of the current list.
Syntax of List Extend –
list.extend(iterable)Append a list to the end of another list –
In [1]: companies = ['Google','Apple','Amazon']
In [2]: more_companies = ['Microsoft','Facebook']
In [3]: companies.extend(more_companies)
In [4]: companies
Out[4]: ['Google', 'Apple', 'Amazon', 'Microsoft', 'Facebook']
Add elements of a tuple or set to a list –
In [6]: companies = ['Google','Apple']
In [7]: comapnies_tuple = ('Amazon','Microsoft')
In [8]: companies_set = {'Facebook','Netflix'}
In [9]: # add a tuple to a list
In [10]: companies.extend(comapnies_tuple)
In [11]: companies
Out[11]: ['Google', 'Apple', 'Amazon', 'Microsoft']
In [12]: # add a set to a list
In [13]: companies.extend(companies_set)
In [14]: companies
Out[14]: ['Google', 'Apple', 'Amazon', 'Microsoft', 'Netflix', 'Facebook']
Difference between Append and Extend –
In [15]: nums1 = [5, 10, 15]
In [16]: nums2 = [5, 10, 15]
In [17]: nums3 = (20, 25)
In [18]: nums1.extend(nums3)
In [19]: nums1
Out[19]: [5, 10, 15, 20, 25]
In [20]: nums2.append(nums3)
In [21]: nums2
Out[21]: [5, 10, 15, (20, 25)]