bytearray

Bytearray:

Bytearray is exactly same as bytes data type except its elements can be modified

Syntax:

1. create one list elements

2. type cast list element into bytearray elements

(1)Variable=[no1 ,no2,…]

Variable=bytearray(variable) #Type casting from list elements into bytearray elements

(2) Direct way to create

Variable=bytearray([no1,no2,….])

Example:

>>> a=[10,20,30] #list is created

>>> a=bytearray(a) #type casted from list elements into bytearray elements

>>> for i in a:print(i) #processing each elements where i varies from index 0th element to size-1 #elements.

10

20

30

Example for 2^nd way:

a=bytearray([10,20,30])

We can modify the values

a[0]=15 #we can modify

The previous session we have discussed so far:

Data types:

Data type	Description	Is immutable?	Example
int	Used to represent the numbers	Immutable	a=10
float	Used to represent decimal point numbers	Immutable	a=12.5
complex	Used to represent complex nos	Immutable	a=2+4j or a=2+4J
bool	Used to represent the logical values(True/False)	Immutable	a=True b=False
str	Used to represent collection of characters, should be enclosed within single quote or double quotes	Immutable	S=’ravi’ A=””Vij is a cool city””” b=”2+%j” c=’b’
Bytes	Used to represent a collection of byte values from 0 to 255	Immutable	a=bytes([120,20,30])
Bytearraya	Used to represent a collection of byte values from 0 to 255	Mutable	a=bytearray([10,20,30])
Range	Used to represent a range of values	Immutable	r=range(10) a=range(0,10) b=range(1,10,3)
List	Used to represent an ordered collection of elements(objcts)	Mutable	a=[10,20,30,40]
Tuple	Used to represent an ordered collection objects (elements)	Immutable	a=(2,4,5,6)
Set	Used to represent an unordered collection unique objects	Mutable	a={1,2,3,4}
Frozenset	Used to represent an unordered collection of objects	Immutable	s={1,2,’ravi’,4} a=frozenset(s) or a=frosenset({1,2,’ravi’,4})
Dict	Used to represent a group of key and value pair	Mutable	a={10:’ravi’,20:’sita’}
None	Used to represent no value or Nothing		def  sum():    print(“hi”) print(sum()) output: None

Constants in Python:

Defn: A constant is similar to a variable but its value can not be modified or changed in the course of the program execution.

The constant concept is not applicable in Python. It is possible in Java, C++ and C languages.

But A developer can indicate a variable as constant by writing its name in all upper case letters. 

For our convenience we use uppercase characters.

Example:

In mathematics, 'PI' value is 3.1714 which never changes and it is constant. 

PI=3.1714  #It is just convention but we can change the value.

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