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Lesson Note

Computer Science

Class - XI

Chapter – Data Handling

A data type, in programming, is a classification that specifies which type of value a variable has
and what type of mathematical, relational or logical operations can be applied to it without
causing an error.
A string, for example, is a data type that is used to classify text and an integer is a data type
used to classify whole numbers.
Arithmetic operators will work with numbers but not string.
Built in core data types available in Python are:
• Numbers (int, boolean, float, complex)
• String
• List
• Tuple
• Dictionary

Data Types
Data type tells the compiler/interpreter how the programmer intends to use the variable/data
in it.
Built in core data types available in Python are:
• Numbers (int, boolean, float, complex)
• String
• List
• Tuple
• Dictionary

Integer
Can store both positive and negative integers (no decimal part) of any length (limitation is,
available memory )
Ex. 235, -4579, 1537000
0o457, 0O306 (Octal , 0-zero, o/O-letter)
0x69A, 0X5B8 (Hexadecimal, 0-zero, x/X-letter)
25,900 #invalid as , not permitted

Boolean
Boolean represents truth value TRUE/YES/1 or FALSE/NO/0
A Boolean literal is a literal having or two possible values True or False
bool returns the boolean equivalent of 0 or 1.
Ex.
>>>bool(0)
False