Data Types In Python.pptx

Data Types
In Python
Prepared By;
Yatharth Chaudhary
22HCS4160

Data Types
Data type refers to the tvpe and size of data. Variables can hold values of
different data types. Python is a purely object oriented language. It refers
to everything as an object, including numbers and strings.

The five standard
data types supported
by python includes:
Number
String
List
Tuple
Dictionary

Numbers
It refers to a numeric value which includes;
• Integers
• Long Integers
• Floating Point
• Complex Numbers

Integers
In Python, integers are zero, positive or negative whole
numbers without a fractional part and having unlimited
precision, e.g. 0, 100, -10.
 Integers can be binary, octal and hexadecimal.

 All integers variables are object of the int class. Use the type() method to get the class name.
 Leading zeros in non-zero integers are not allowed, e.g. 000123 is invalid number, 0000 is 0.
 The int() function converts a string or float to int.

Float
In Python, floating point numbers (float) are positive and
negative real numbers with a fractional part denoted by the
decimal symbol . or the scientific notation E or e.
E.g. 1234.56, 3.142, -1.55, 0.23

 Floats has the maximum size depends on your system. The float beyond its maximum size
referred as "inf", "Inf", "INFINITY", or "infinity". Float 2e400 will be considered as infinity for
most systems.
 Scientific notation is used as a short representation to express floats having many digits.
E.g. 345.56789 is represented as 3.4556789e2 or 3.4556789E2
 Use the float() function to convert string, int to float.

Complex Numbers
A complex number is a number with real and imaginary components. For
example, 5 + 6j is a complex number where 5 is the real component and 6
multiplied by j is an imaginary component.
You must use j or J as imaginary component. Using other character will throw syntax error.

Boolean
 A variable of Boolean type can have one of the two values i.e. either True or False.
 The boolean value has a technical name as bool.
 The Boolean values True and False start with capital letters T and F.
 When you compare two numbers or strings, python returns the result as a Boolean
value.

 When a value evaluates to True, it’s truthy and if a value evaluates to False, it’s falsy.
 To find out if a value is True or False, you can use the bool() function.
As you can see clearly from the output, some values evaluates to True and others evaluate to False.

Example:
a = 5
print(a, "is of type", type(a))
a = 2.0
print(a, "is of type", type(a))
a = 1+2j
print(a, "is complex no.?", isinstance(1 +2j.complex))
Output:
5 is of type <class 'int>
2.0 is of type <class 'float’>
(1+2j) is complex no.? True

List
 List is an ordered sequence of items. It is one of the most
used data type in Python and is very flexible.
 All the items in a list do not need to be of the same type.
 Lists are mutable, The elements in the list can be modified
 To declare a list in python, separate the items using commas
and enclose them within square brackets[].

Tuple
Tuple is an ordered sequence of items same as list. The only
difference is that tuples are immutable. Tuples once created
cannot be modified.
It is defined within parentheses () where items are separated by
commas.

Dictionary
 A python dictionary is an unordered collection of key:value
pairs.
 Keys and values can be of any type in a dictionary.
 Items in dictionary are separated by comma and enclosed
with the curly-braces { }.
 It is very useful to retrieve data in an optimized way among a
large amount of data.

Strings
 A String in python can be a series or a sequence of alphabets,
numerals and special characters.
 The string type in Python is called str.
 Single quotes or double quotes are used to represent strings.
 Strings are immutable.
 A string in Python can contain as many characters as you wish, a string
can also be empty

Data Types In Python.pptx

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