Python Data Types

Taken from my in depth Python Tutorial for Beginners the following page describes common data types.

• Strings
• Dictionaries
• Numbers
• Booleans
• Lists
• Sets
• Frozensets
• Tuples
• Ranges
• Dictionaries
• None

One way to classify data types is to determine if the data can be changed after creation or not, this is called mutable or immutable.

Mutable data types are:

• Dictonaries
• Lists
• Sets

Immutable data types are:

• Strings
• Numbers
• Tuples
• Frozensets

Python Strings

Probably the most widely used data type. You will certainly use strings in nearly every Python programme you use.

A string in Python is a sequence of characters, letters numbers and other characters enclosed by quotes.

All the examples below are described in this video.

To create a string in Python we need to define it as below:

stringexample = "This is a string" 

One of the main elements of a string is indexing, as a string is a list of elements you can reference each element in a string by a number, however starting from the left the index of the first element (in our case T) would be 0.

So to access an element in my string above I would enter the command:

stringexample[0]

This would output the value T

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