Variable is the name given to the memory location where data is stored. Once a variable is stored, space is allocated in memory. Variables are named locations that are used to store references to the object stored in memory.
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Now, coming to this article, here are some of the topics that will be covered in this article:
These are the few rules to define a python variable:
There is no need for an explicit declaration to reserve memory. The assignment is done using the equal to (=) operator.
Multiple variables can be assigned to the same variable.
Multiple variables can be assigned to multiple objects.
After declaring a variable, one can again declare it and assign a new value to it. Python interpreter discards the old value and only considers the new value. The type of the new value can be different than the type of the old value.
A variable scope defines the area of accessibility of the variable in the program. A Python variable has two scopes:
When a variable is defined inside a function or a class, then it’s accessible only inside it. They are called local variables and their scope is only limited to that function or class boundary.
If we try to access a local variable outside its scope, we get an error that the variable is not defined.
When the variable is not inside a function or a class, it’s accessible from anywhere in the program. These variables are called global variables.
One can delete variable using the command “del”.
In the example below, the variable “d” is deleted by using command Del and when it is further proceeded to print, we get an error “variable name is not defined” which means the variable is already deleted.
In this article we have learned the concepts of Python variables which are used in every program. We also learned the rules associated to the naming of a variable, assigning value to a variable, scope of a variable and deleting a variable.
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