Python Data Structures Conversions (List , Set & Dictionary). A guide to Python Data Structures (List, Set & Dictionary) and conversions between them without using inbuilt Python commands.
In Python, there is primarily two data types mainly Atomic *and *Collective. Atomic data types are indivisible which represents only a single data value. Some examples are integer (int), floating point (float) and boolean (bool). Collective **data types on the other hand are a collections of multiple data values which consists of string (str), list (list), tuple (tuple), set (set) and dictionary (dict). This article will focus on **list, set *and *dictionary, and ways to convert between them without any inbuilt python commands.
Python list is a data type for a collection items which are generally related and they can hold data objects of any data type (i.e. string, int, bool) as shown below. They are usually captured using square brackets (i.e. [ ])
a_list = [1, 'two', 3.0, '4']
Some common useful list commands are as follow. Note that indexing in Python starts at 0 instead of 1 in other programming languages like R.
## define empty list a_list =  ## append new item into list at the end of the list a_list.append(new_item) ## append new item into list at a specific index a_list.insert(index, new_item) ## remove an item from the list based on index a_list.pop(0) ## remove an item from the list based on item value a_list.remove('two') ## sort the items in ascending order, note that the data types must be similar a_list.sort() ## reverse the order of the items a_list.reverse()
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