How python append list

append() and extend() in Python
Append: Adds its argument as a single element to the end of a list. The length of the list increases by one.
python append list
syntax:
Adds an object (a number, a string or a
another list) at the end of my_list
mylist.append(object) filternone
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brightness4 mylist = ['geeks', 'for']
mylist.append('geeks') print mylist
Output:
['geeks', 'for', 'geeks']
NOTE: A list is an object project. If you append another list onto a list, the parameter list will be a single object at the end of the list.
filternone edit playarrow
brightness4 mylist = ['geeks', 'for', 'geeks']
anotherlist = [6, 0, 4, 1] mylist.append(anotherlist) print mylist
Output:
['geeks', 'for', 'geeks', [6, 0, 4, 1]]
extend(): Iterates over its argument and adding each element to the list and extending the list. The length of the list increases by number of elements in it’s argument.
syntax:
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Each element of an iterable gets appended
to my_list
mylist.extend(iterable) filternone
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brightness4 mylist = ['geeks', 'for']
anotherlist = [6, 0, 4, 1] mylist.extend(anotherlist) print mylist
Output:
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['geeks', 'for', 6, 0, 4, 1]
NOTE: A string is an iterable, so if you extend a list with a string, you’ll append each character as you iterate over the string.
filternone edit playarrow
brightness4 mylist = ['geeks', 'for', 6, 0, 4, 1]
mylist.extend('geeks') print mylist
Output:
['geeks', 'for', 6, 0, 4, 1, 'g', 'e', 'e', 'k', 's']
Time Complexity:
Append has constant time complexity i.e.,O(1).
Extend has time complexity of O(k). Where k is the length of list which need to be added.
Reference: https://www.pythonslearning.com/