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os、context或对象中是否有一个参数event可以告诉您环境变量是否已加密，或者是否有任何变量已加密？

encrypted_db_password = os.environ['db_password']
try:
    print 'attempting to decrypt'
    db_password = boto3.client('kms').decrypt(CiphertextBlob=b64decode(encrypted_db_password)['Plaintext']
    print 'successfully decrypted'
except:
    print "Error decrypting, assuming a local environment"
    db_password = encrypted_db_password

将尝试解密变量并在失败时使用明文，但不优雅且容易出错。有没有更好的办法？

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