Specify a Variable Type.

 Specify a Variable Type:

There may be times when you want to specify a type on to a variable. This can be done with casting. Python is an object-orientated language, and as such it uses classes to define data types, including its primitive types.
Casting in python is therefore done using constructor functions:

• int() - constructs an integer number from an integer literal, a float literal (by rounding down to the previous whole number), or a string literal (providing the string represents a whole number)
• float() - constructs a float number from an integer literal, a float literal or a string literal (providing the string represents a float or an integer)
• str() - constructs a string from a wide variety of data types, including strings, integer literals and float literals
• bool() - function allows you to evaluate any value, and give you True or False in return. 
• List is a collection which is ordered and changeable. Allows duplicate members. 
• Tuple is a collection which is ordered and unchangeable. Allows duplicate members. 
• Set is a collection which is unordered and unindexed. No duplicate members. 
• Dictionary is a collection which is unordered, changeable and indexed. No duplicate members.