Python Tutorial - Python Variables and Types

Introduction

When you create variable in python or in any other languages this means you reserve a memory location to store the value. The value stored in a variable can be accessed or updated later. The interpreter allocates memory on the basis of data type of a variable.

Python Variable Name Rules

• The start character can be the underscore "_" or a capital or lower case letter.
• Other characters can be letters, numbers or _
• Case Sensitive.
• Can be any length.
• Can't use any Python reserved words as  a variable name.

Python Data Type

• String.
• Integer.
• Float number.
• Boolean.
• Tuples.
• List.
• Dictionaries.

example:

Item_Name = "PC RAM" #A string
Item_Quantity = 10   #An integer assignment
Item_Price = 49.95   #A floating point
Item_Valid = True    #A Boolean
Item_Colors = ('Black','Blue','Red','White') #A Tuples
Item_List = ['RAM2G','RAM4G','RAM8G','RAM16G'] #A List
Item_Location = {"State":'NY', "City":'New York', "Address":'12405  ACRA'} #A Dictionaries

Print some variables in last example:

print (Item_Name,Item_Quantity,Item_Price) #print all variables

#==================================== Result ===============
('Dell Laptop', 10, 49.95)

Multiple Assignment

Python allows you to assign a single value to several variables simultaneously.

Item_Name, Item_Quantity, Item_Price  = "PC RAM", 10, 49.95
print (Item_Name,Item_Quantity,Item_Price) #print all variables

#==================================== Result ===============
('Dell Laptop', 10, 49.95)

v1 = v2 = v3 = v4 = 10
print (v1, v2, v3, v4) #print all variables

#==================================== Result ===============
(10, 10, 10, 10)

All variables in the last example are pointing to the same memory location which contain the value 10, we can print that memory location.

print id(v1)

#==================================== Result ===============
10085612

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