Python Variables

Chapter: Python Last Updated: 21-09-2018 13:20:12 UTC

Program:

            /* ............... START ............... */
                
#Variable declaration in Python
var1 = 10
name = "Mathew"
print(var1)
print(name)

outputVar = "welcome"
print("Hi" + outputVar)

# Automatic type of variable in python
varChange = 10 # Here the type is int
varChange = "Variable type is changed to string" # How it is changed to string type
print(varChange)

# + symbol is used to add two variables (But the type should be of same )
x = "Hello  "
y = "how r u"
z =  x + y
print(z)

x = 2
y = 3
z =  x + y
print(z)

                /* ............... END ............... */
        

Output

10
Mathew
Hiwelcome
Variable type is changed to string
Hello  how r u
5

Notes:

  • Unlike other programming in Python we can instantly create a variable with a name and assign the value to it. No need to specify the type of variable like in other programming language like java etc..
  • By using print statement you can print the variable in the console of python.
  • In python we can dynamically change the type of variable during the execution of program. In the above program you can see that first we assign varChanage with value "10" of int type and then we assign a String type to varChange, then it will automatically change type to String. This is wonderful feature in python.
  • "+" symbol in Python is used to add two variables. If it is arithmetic variable it will add the values or if the it is a string it will concatenate the two strings.
  • Python variable declaration guidelines are shown below.
  • Python variable should starts with letter or the underscore character.
  • Variable cannot start with a number.
  • Variable can contain only alpha-numeric characters and underscores (A-z, 0-9, and _ ).
  • Python variable names are case sensitive.

Tags

Python Variables, python declare variable type, python global variables, data types in python, python variable scope, python variable type.

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