NumPy: Encode all the elements of a given array in cp500 and decode it again

Last update on April 29 2025 13:01:12 (UTC/GMT +8 hours)

6. Encode and Decode Strings in cp500

Write a NumPy program to encode all the elements of a given array in cp500 and decode it again.

Sample Solution:

Python Code:

# Importing necessary library
import numpy as np

# Creating a NumPy array containing strings
x = np.array(['python exercises', 'PHP', 'java', 'C++'], dtype=np.str)

# Displaying the original array
print("Original Array:")
print(x)

# Encoding the strings in the array using 'cp500' encoding
encoded_char = np.char.encode(x, 'cp500')

# Decoding the encoded strings using 'cp500' encoding
decoded_char = np.char.decode(encoded_char, 'cp500')

# Displaying the encoded and decoded strings
print("\nencoded =", encoded_char)
print("decoded =", decoded_char)

Sample Input:

(['python exercises', 'PHP', 'java', 'C++'], dtype=np.str)

Sample Output:

encoded = [b'\x97\xa8\xa3\x88\x96\x95@\x85\xa7\x85\x99\x83\x89\xa2\x85\xa2'
 b'\xd7\xc8\xd7' b'\x91\x81\xa5\x81' b'\xc3NN']
decoded = ['python exercises' 'PHP' 'java' 'C++']

Explanation:

In the above exercise –

x1 = np.array(['python exercises', 'PHP', 'java', 'C++'], dtype=np.str): This line creates a 1-dimensional NumPy array x1 with 4 elements of string data type. The elements are ' python exercises ', 'PHP', 'Java', and 'C++'.

encoded_char = np.char.encode(x, 'cp500'): This line encodes the given strings in x into bytes using the cp500 encoding. The resulting encoded byte string is stored in the encoded_char variable.

decoded_char = np.char.decode(encoded_char,'cp500'): This line decodes the previously encoded byte string using the same cp500 encoding. The resulting decoded string is stored in the decoded_char variable.

For more Practice: Solve these Related Problems:

Write a function that encodes an array of strings in cp500 and then decodes them back, verifying the round-trip conversion.
Create a solution that compares the original and decoded arrays element-wise for equality.
Test the encoding/decoding process on strings containing special characters to ensure proper handling.
Implement a method that converts the encoded byte strings into hexadecimal representation before decoding.

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