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Python: Variables

A variable is created the moment you first assign a value to it. Variables are nothing but reserved memory locations to store values. It is the basic unit of storage in a program. A variable is only a name given to a memory location, all the operations done on the variable effects that memory location.

Python variable is also known as an identifier and used to hold value.

Rules for Creating Variables

  • 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).
  • The reserved words(keywords) cannot be used naming the variable.

Declaring Variable and Assigning Values

The declaration happens automatically when we assign a value to a variable. The equal sign (=) is used to assign values to variables.

Example:

age = 10
name = 'abc'
salary = '10000.50'

print(age)
print(name)
print(salary)

Output:

10
abc
10000.50

Multiple Assignment for Variables

Python allows assigning a single value to several variables simultaneously with “=” operators. 

a = b = c = 20

print('a=',a)
print('b=',b)
print('c=',c)
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Submitted by devanshi.srivastava on June 24, 2021

Devanshi, is working as a Data Scientist with iVagus. She has expertise in Python, NumPy, Pandas and other data science technologies.

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