variable assignments

Variable Assignment

In the previous section we discussed about working with numbers in Python but what do these numbers represent?? A variable is a user-defined name that reserves some space in memory in order to store the values assigned to it. This means that whenever you create a variable , you reserve some space in the memory. It is always nice to assign these values a variable name to easily reference them later on in our code.

By community conventions , it is always suggested to use variable name which is somehow related to the value stored in it.

A variable is assigned a value in the following way:
Variablename = valueassigned , here '=' sign represents the assignment operator.

Rules for naming a variable

Names can not start with a number.
There can be no spaces in the name , use _ instead.
Can't use any of the special symbols : "',<>\()@#%$*-~
Avoid using built-in keywords like "list" and "str".

Bored of all the theory. Let us run a few codes where we create variables and assign values to it.

w = 5
print(w)

output:

Alright let us perform few basic mathematical manipulation using variables. What do you think will be the output of the following code?

a = 10
a = a + a
a = a * a
print(a)

output:

explanation:

1. variable a is assigned value of 10
2. variable a is reassigned a value of (a+a) = 20
3. variable a is reassigned a value of (a*a) = 400
4. 400 is printed on the output screen

Python is a "Dynamically-Typed" language

A language can be dynamically-typed , statically-typed or hybrid(static and dynamic). The basic difference between them is in terms of the flexibility it provides in reassigning a variable. In a dynamic language , a variable can be reassigned values of different data type at different sections of the code while the same can't be done in a statically-typed language.

STATIC or HYBRID(c++,c...)

int name = 3
name = "john"

DYNAMIC LANGUAGE(Python)

name = 3
name = "john"

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