Select the true statements about the following invocation: (Select two answers.)
Correct Answer: A,D
Explanation It addresses a service deployed at localhost (the host where the code is run). This statement is true because localhost is a special hostname that refers to the local machine or the current host where the code is run. It is equivalent to using the IP address 127.0.0.1, which is the loopback address of the network interface. By using localhost as the hostname, the invocation addresses a service that is deployed on the same machine as the client. It addresses a service listening at port 3000. This statement is true because port 3000 is the part of the URL that follows the colon after the hostname. It specifies the port number where the service is listening for incoming requests. A port number is a 16-bit integer that identifies a specific process or application on a host. By using port 3000, the invocation addresses a service that is listening at that port. It addresses a service whose timeout is set to 3000 ms. This statement is false because timeout is not a part of the URL, but a parameter that can be passed to the requests.get () function in Python. Timeout specifies how long to wait for the server to send data before giving up. It is measured in seconds, not milliseconds. By using timeout=3, the invocation sets the timeout to 3 seconds, not 3000 ms. It addresses a service located at the following address local.host.com. This statement is false because local.host.com is not the same as localhost. Local.host.com is a fully qualified domain name (FQDN) that consists of three parts: local, host, and com. It requires DNS resolution to map it to an IP address. Localhost, on the other hand, is a special hostname that does not require DNS resolution and always maps to 127.0.0.1. By using localhost as the hostname, the invocation does not address a service located at local.host.com. References: https://docs.python.org/3/library/requests.html : https://en.wikipedia.org/wiki/Localhost : https://en.wikipedia.org/wiki/Port_(computer_networking) : https://en.wikipedia.org/wiki/Fully_qualified_domain_name
Question 2
What is ElementTree?
Correct Answer: D
Explanation ElementTree is a Python built-in module that provides a simple and efficient API for parsing and creating XML data. It allows you to access and manipulate XML data in a very straightforward way, making it easy to write XML processing applications.
Question 3
Which function or operator should you use to obtain the answer True or False to the question: "Do two variables refer to the same object?"
Correct Answer: D
Explanation To test whether two variables refer to the same object in memory, you should use the is operator. The is operator returns True if the two variables point to the same object in memory, and False otherwise. For example: a = [1, 2, 3] b = a c = [1, 2, 3] print(a is b) # True print(a is c) # False In this example, a and b refer to the same list object in memory, so a is b returns True. On the other hand, a and c refer to two separate list objects with the same values, so a is c returns False.
Question 4
What does the term deserialization mean? Select the best answer.
Correct Answer: A
Explanation answer A. Deserialization is the process of converting data that has been serialized or encoded in a specific format, back into its original form as an object or a data structure in memory. In Python, this typically involves creating Python objects based on sequences of bytes that have been serialized using a protocol such as JSON, Pickle, or YAML. For example, if you have a Python object my_obj and you want to serialize it to a JSON string, you might do something like this: importjson serialized_obj = json.dumps(my_obj) To deserialize the JSON string back into a Python object, you would use the json.loads() method: deserialized_obj = json.loads(serialized_obj) This would convert the JSON string back into its original Python object form.
Question 5
Select the true statement about the socket. gaierror exception.
Correct Answer: D
Explanation The socket.gaierror exception is raised when an address-related error caused by the getaddrinfo() and getnameinfo() functions occurs. These functions are used to translate hostnames to IP addresses and vice versa, and the gaierror exception is raised if they fail to perform this translation.
