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What is the numpy.char.decode() function in Python?

Onyejiaku Theophilus Chidalu

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

Overview

NumPy’s char.decode() function in Python is simply used to call the str.decode function element-wise.

Syntax

char.decode(a, encoding=None, errors=None)

Parameters

The char.decode() function takes the following parameter values:

  • a: This represents the array of strings or the unicode object.
  • encoding: This represents the name of the encoding. Some encoding includes: utf-8, UTF-16, UTF-32, ascii, and cp037 etc.
  • errors: This specifies how errors should be handled. This parameter is optional.

Return value

The char.decode() function returns an array object.

Note: It is worth noting that the type of output will depend on the value of the encoding specified.

Code

import numpy as np
# creating an array
myarray = np.array(["Theo", "How", "Are", "You"])
# to eccode the array using ascii encoding
To_encode = np.char.encode(myarray, encoding = 'ascii')
# to decode the array using the char.decode() function
To_decode = np.char.decode(To_encode, encoding= "ascii")
print(To_encode)
print(To_decode)
Implementing the char.decode() function

Explanation

  • Line 1: We import the numpy module as np.
  • Line 4: We create an array myarray using the array() function and initialize it with four strings.
  • Line 7: We encode the array with ascii encoding, using the char.encode() function. The result is assigned to a variable To_encode.
  • Line 10: We decode the array using the char.decode() function. The result is assigned to a variable To_decode.
  • Line 12: We print the encoded variable To_encode.
  • Line 13: We print the decoded variable To_decode.

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Onyejiaku Theophilus Chidalu

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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