List and Dictionary

List¶

Command	Description
`mylist.append('x')`	Add single item at last of list (changes original list)
`mylist.extend(list2)`	Append whole list at last of list (changes original list)
`mylist.insert(pos, elem)`	Insert elem at pos of list1
`mylist.remove(elem)`	Removes first found elem from list1; gives error if not found
`mylist.index(elem)`	Returns index of elem
`mylist.index(elem, i, j)`	Searches and returns index of elem from mylist[i: j]
`mylist.pop(index)`	Removes elem at position index, else removes last item if index not given
`mylist.count(elem)`	Returns count of elem in the list
`mylist.sort(key, reverse=True/False)`	Key is optional user defined function
`new_list = sorted(mylist, reverse=False, key=method_name)`	unlike sort method, it returns a new
`mylist2 = mylist1.copy()`	Copy list1 to list2
`mylist.clear()`	same as del mylist[:]
`mylist.reverse()`	reverse all items of mylist
`filter(method, mylist)`	Returns iterable for each item of list1 for which 'method' returns true
`zip(mylist, mylist2)`	Zip both lists upto shorter list
`max(mylist)`	Returns max valued item of mylist
`min(mylist)`	Returns min valued item of the list
`any(mylist)`	True if any one of the list item is true; in case of dict, it considers keys only
`all(mylist)`	True if any all of the list items are true; in case of dict, it considers keys only
`enumerate(mylist, start)` `mylist = [1, 2, 55, 52, 23]` `for key, val in enumerate(mylist, 5):` `print(key, val)`	5 1 6 2 7 55 8 52 9 23

Command	Description
`dict.fromkeys(mylist)`	New dictionary with 'list_items: None' key value pair
`mydict.get(key, value2)`	Return value of given key, and if key not found, returns value2
`mydict.popitem()`	Returns and remove arbitrary key: value pair
`mydict.pop(key)`	Remove key: value
`mydict.keys()`	List of all keys of mydict
`mydict.values()`	List of all values of mydict
`mydict.update(k2=v2, k3=v3..)`	Updating dictionary, if key present update value else add new key:value pair
`new_dict = sorted(mydict)`	Sorted by keys