Basic Python | Data types and Data Structures

Variables and Assignment:
In many programming languages, variables are best thought of as containers or buckets into which you put data. So in C, for example, when you write

// C code
int x = 4;

you are essentially defining a "memory bucket" named x, and putting the value 4 into it. In Python, by contrast, variables are best thought of not as containers but as pointers. So in Python, when you write

x = 4

you are essentially defining a pointer named x that points to some other bucket containing the value 4. Python Variables Are Pointers.
Basic Data Types:

Built-In Data Structures:

We have seen Python's simple types: int, float, complex, bool, str, and so on. Python also has several built-in compound types, which act as containers for other types. These compound types are:

Type Name	Example	Description
list	[1, 2, 3]	Ordered collection
tuple	(1, 2, 3)	Immutable ordered collection
dict	{'a':1, 'b':2, 'c':3}	Unordered (key,value) mapping
set	{1, 2, 3}	Unordered collection of unique values

A list is a one-dimensional, mutable ordered sequence of items which can be of mixed data types.

A tuple is a one-dimensional, immutable ordered sequence of items which can be of mixed data types.

Dictionaries are extremely flexible mappings of keys to values, and form the basis of much of Python's internal implementation. They can be created via a comma-separated list of key:value pairs within curly braces. You can view the keys and values in a dict, either separately or together, using the syntax shown here

A set is an unordered collection of unique elements.