In this blogs, we will be working with variables
Variables are memory location which stores values. Variables are treated differently in Python than in C and Java programming languages. Considered a below statement
b = 10
When the above statement is executed, it will allocate memory location with a name ‘b’ and will hold a value 10. Use id() built in function to find memory address which is allocated to variable b
b = 10 print(id(b))
In this way, for every variable that is created, there will be a memory location allocated to store value. Now if we change the value of the variable, a new memory location is allocated.
b = 90
In the above statement, previous value of the variable b was 10 and then it has been changed to 90. In this case, a new memory location is allocated with a value of 90. Below is the code which uses id() function to check memory addresses.
b = 10 print(id(b)) b = 90 print(id(b))
It shows two memory addresses for two different values with the same name
Rules for variables name
A variable name must start with a letter or the underscore character
A variable name cannot start with a number
A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )
Variable names are case-sensitive (name, Name and NAME are three different variables)