How to decrypt an AWS Lambda environment variable

decrypt_environment_variable.py

import boto3        # AWS SDK for Python
import os

from base64 import b64decode

# Retrieve environment variables
encrypted_environment_variable_a = os.environ['a']
encrypted_environment_variable_b = os.environ['b']

# KMS Client
kms = boto3.client('kms')

# Decrypt encrypted environment variables
decrypted_variable_a = boto3.client('kms').decrypt(CiphertextBlob=b64decode(encrypted_environment_variable_a))['Plaintext'].decode('utf-8')
decrypted_variable_b = boto3.client('kms').decrypt(CiphertextBlob=b64decode(encrypted_environment_variable_b))['Plaintext'].decode('utf-8')

Thanks mate !!