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Signed and Unsigned Integer Arrays in Python

Python | Signed and Unsigned Integer Array: Here, we are going to learn how to declare, use unsigned and signed integer array in Python?
Submitted by IncludeHelp, on September 21, 2018

An array can be declared by using "array" module in Python.

Syntax to import "array" module:

    import array as array_alias_name

Here, import is the command to import Module, "array" is the name of the module and "array_alias_name" is an alias to "array" that can be used in the program instead of module name "array".

Array declaration:

To declare an "array" in Python, we can follow following syntax:

    array_name   =   array_alias_name.array(type_code, elements)

Here,

  • array_name is the name of the array.
  • array_alias_name is the name of an alias - which we define importing the "array module".
  • type_code is the single character value – which defines the type of the array elements is the list of the elements of given type_code.

Declaring Signed and Unsigned Integer Array

Signed Integer is defined by using type_code "i" (small alphabet "i") and it contains negative and posited integers.

Unsigned Integer is defined by using type_code "I" (Capital alphabet "I") and it contains only positive integers.

Examples to declare and initialize "unsigned" and "signed" integer array in Python:

# unsigned integer array 
a = arr.array ("I", [10, 20, 30, 40, 50])
# signed integer array 
b= arr.array ("i", [10, -20, 30, -40, 50])

Program:

# importing array class to use array 
import array as arr

# an unsigned int type of array 
# declare and assign elements 
a = arr.array ("I", [10, 20, 30, 40, 50] )
# print type of a 
print ("Type of a: ", type (a))
# print array 
print ("Array a is: ")
print (a)

# a signed int type of array 
# declare and assign elements 
b = arr.array ("i", [10, -20, 30, -40, 50] )
# print type of a 
print ("Type of b: ", type (a))
# print array 
print ("Array b is: ")
print (b)

Output

Type of a:  <class 'array.array'>
Array a is:
array('I', [10, 20, 30, 40, 50])
Type of b:  <class 'array.array'>
Array b is:
array('i', [10, -20, 30, -40, 50])




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