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numpy.binary_repr() in Python
  • Last Updated : 29 Nov, 2018

numpy.binary_repr(number, width=None) function is used to represent binary form of the input number as a string.

For negative numbers, if width is not given, a minus sign is added to the front. If width is given, the two’s complement of the number is returned, with respect to that width.
In a two’s-complement system, negative numbers are represented by the two’s complement of the absolute value. This is the most common method of representing signed integers on computers.

Syntax : numpy.binary_repr(number, width=None)

Parameters :
number : Input number. Only an integer decimal number can be used as input.
width : [int, optional] The length of the returned string if number is positive, or the length of the two’s complement if number is negative, provided that width is at least a sufficient number of bits for number to be represented in the designated form.
If the width value is insufficient, it will be ignored, and number will be returned in binary (number > 0) or two’s complement (number < 0) form with its width equal to the minimum number of bits needed to represent the number in the designated form.

Return : binary string representation of the input number.



Code #1 : Working




# Python program explaining
# binary_repr() function
  
import numpy as geek
in_num = 10
  
print ("Input  number : ", in_num)
  
out_num = geek.binary_repr(in_num) 
print ("binary representation of 10 : ", out_num) 


Output :

Input  number :  10
binary representation of 10 :  1010

 
Code #2 :




# Python program explaining
# binary_repr() function
import numpy as geek
  
in_arr = [5, -8 ]
   
print ("Input array : ", in_arr) 
  
# binary representation of first array  
# element without using width parameter
out_num = geek.binary_repr(in_arr[0])
print("Binary representation of 5")
print ("Without using width parameter : ", out_num) 
  
# binary representation of first array
# element using width parameter
out_num = geek.binary_repr(in_arr[0], width = 5)
print ("Using width parameter: ", out_num) 
  
print("\nBinary representation of -8")
  
# binary representation of 2nd array
# element without using width parameter
out_num = geek.binary_repr(in_arr[1])
print ("Without using width parameter : ", out_num) 
  
# binary representation of 2nd array
# element  using width parameter
out_num = geek.binary_repr(in_arr[1], width = 5)
print ("Using width parameter : ", out_num) 


Output :

Input array :  [5, -8]
Binary representation of 5 
Without using width parameter :  101
Using width parameter:  00101

Binary representation of -8  
Without using width parameter :  -1000
Using width parameter :  11000

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