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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: File Processing and Serialization | 15% | - Data storage and transfer
|
| Topic 2: Advanced Object-Oriented Programming | 25% | - Object-oriented concepts
|
| Topic 3: GUI Programming | 20% | - Graphical user interfaces with Tkinter
|
| Topic 4: Network Programming | 20% | - Communication and networking
|
| Topic 5: Multithreading and Concurrency | 10% | - Concurrent programming
|
| Topic 6: Python Standard Library and Best Practices | 10% | - Advanced Python development
|
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NEW QUESTION # 36
Analyze the following snippet and decide whether the code is correct and/or which method should be distinguished as a class method.
Answer: C
Explanation:
Explanation
The correct answer is B. The getNumberofCrosswords() method should be decorated with @classmethod. In the given code snippet, the getNumberofCrosswords method is intended to be a class method that returns the value of the numberofcrosswords class variable. However, the method is not decorated with the @classmethod decorator and does not take a cls parameter representing the class itself. To make getNumberofCrosswords a proper class method, it should be decorated with @classmethod and take a cls parameter as its first argument.
The getNumberofCrosswords() method should be decorated with @classmethod.
This is because the getNumberofCrosswords() method is intended to access the class-level variable numberofcrosswords, but it is defined as an instance method, which requires an instance of the class to be created before it can be called. To make it work as a class-level method, you can define it as a class method by adding the @classmethod decorator to the function.
Here's an example of how to define getNumberofCrosswords() as a class method:
classCrossword:
numberofcrosswords =0
def __init__(self, author, title):
self.author = author
self.title = title
Crossword.numberofcrosswords +=1
@classmethod
defgetNumberofCrosswords(cls):
returncls.numberofcrosswords
In this example, getNumberofCrosswords() is defined as a class method using the @classmethod decorator, and the cls parameter is used to access the class-level variable numberofcrosswords.
NEW QUESTION # 37
Select the true statements about the sqirte3 module. (Select two answers.)
Answer: C,D
Explanation:
A). The sqlite3 module in python provides an interface compliant to the DB-API 2.0. Thus, it follows a standard performance metric that allows for consistency in database programming with python.
B). The special name 'memory' is used to create a database in RAM using the sqlite3 module. Thus, when you use it as the name of the database file while opening a connection, it creates a temporary database that exists only in memory.
Reference: Official Python documentation on sqlite3: https://docs.python.org/3/library/sqlite3.html
NEW QUESTION # 38
Which of the following types cannot be pickled?
Answer: A
Explanation:
The correct answer is B because Python's pickle module can serialize many built-in data types, including integers, floating-point numbers, complex numbers, strings, bytes, bytearrays, booleans, and None. However, it does not serialize the actual implementation or definition body of functions and classes. Top-level functions and classes may sometimes be pickled by reference using their fully qualified names, but their code definitions are not stored inside the pickle byte stream. This distinction matters: pickle records enough information to locate an object again during unpickling, but it does not preserve source code, nested definitions, lambda functions, or dynamically created definitions in a portable way. Therefore, "function and class definitions" is the option that cannot truly be pickled as definitions.
NEW QUESTION # 39
Which of the following examples using line breaks and different indentation methods are compliant with PEP
8 recommendations? (Select two answers.)
Answer: A,C
Explanation:
Explanation
The correct answers are B. Option B and D. Option D. Both options B and D are compliant with PEP 8 recommendations for line breaks and indentation. PEP 8 recommends using 4 spaces per indentation level and breaking lines before binary operators. In option B, the arguments to the print function are aligned with the opening delimiter, which is another acceptable way toformat long lines according to PEP 8. In option D, the second line is indented by 4 spaces to distinguish it from the next logical line.
NEW QUESTION # 40
Select the true statements about sockets. (Select two answers)
Answer: C,D
Explanation:
Explanation
A socket is a connection point that enables a two-way communication between programs running in a network.
This statement is true because a socket is a software structure that serves as an endpoint for sending and receiving data across a network. A socket is defined by an application programming interface (API) for the networking architecture, such as TCP/IP. A socket can be used to establish a communication channel between two programs running on the same or different network nodes12.
A socket is always the secure means by which computers on a network can safely communicate, without the risk of exposure to an attack.
This statement is false because a socket by itself does not provide any security or encryption for the data transmitted over the network. A socket can be vulnerable to various types of attacks, such as eavesdropping, spoofing, hijacking, or denial-of-service. To ensure secure communication, a socket can use additional protocols or mechanisms, such as SSL/TLS, SSH, VPN, or firewall3.
A socket is a connection point that enables a one-way communication only between remote processes.
This statement is false because a socket can enable both one-way and two-way communication between processes running on the same or different network nodes. A socket can be used for connection-oriented or connectionless communication, depending on the type of protocol used. For example, TCP is a connection-oriented protocol that provides reliable and bidirectional data transfer, while UDP is a connectionless protocol that provides unreliable and unidirectional data transfer12.
A socket can be used to establish a communication endpoint for processes running on the same or different machines.
This statement is true because a socket can be used for inter-process communication (IPC) within a single machine or across different machines on a network. A socket can use different types of addresses to identify the processes involved in the communication, such as IP address and port number for network sockets, or file name or path for Unix domain sockets12.
References:
1: https://en.wikipedia.org/wiki/Network_socket 2:
https://www.geeksforgeeks.org/socket-in-computer-network/ 3:
https://www.tutorialspoint.com/what-is-a-network-socket-computer-networks
NEW QUESTION # 41
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