Variables in Python - Definition & Declaration - Python Tutorial for Beginners
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🖥️ How to Create a Variable in Python?
More complex programs need a way of labelling data with a name, so it can be referenced later on. This has the rather wonderful side-effect of making computer code easier to read!
Nonetheless, there are certain rules and regulations that you have to follow, while writing a variable. Let's take a look at the variable definition to understand how we declare a variable in Python.
○ Variable Definition
In a programming language, a variable is a memory location. Think of a variable as a name, attached to a particular object. Variables are like containers for storing data values ... The value that you have stored into this container may change in the future, according to the specifications.
○ Create a Variable / Variable Declaration
In Python, variables do not need to be defined or declared in advance, with any particular type - as it is the case in many other programming languages. Thus, variables can even change type after they have been set. A variable in Python is created as soon as a value is assigned to it, and then you can start using it. Its assignment is done with a single equals sign.
n = 300
This is read or interpreted as “n is assigned the value 300.” Once this is done, n can be used in a statement or expression, and its value will be substituted.
print(n)
OUTPUT: 300
Later, if you change the value of n and use it again, its new value will be substituted instead.
n = 1000
print(n)
OUTPUT: 1000
Python also allows multiple assignment, which makes it possible to assign the same value to multiple variables. The chained assignment above assigns 300 to the variables a, b, and c - simultaneously.
a = b = c = 300
print(a, b, c)
OUTPUT: 300 300 300
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