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| Section | Weight | Objectives |
|---|---|---|
| Python Standard Library and Best Practices | 10% | - Advanced Python development
|
| File Processing and Serialization | 15% | - Data storage and transfer
|
| Network Programming | 20% | - Communication and networking
|
| GUI Programming | 20% | - Graphical user interfaces with Tkinter
|
| Multithreading and Concurrency | 10% | - Concurrent programming
|
| Advanced Object-Oriented Programming | 25% | - Object-oriented concepts
|
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NEW QUESTION # 24
Select the correct statements about the csv module.
(Select two answers.)
Answer: A,D
Explanation:
The correct answers are B and D. In Python's csv module, a normal csv.reader object reads each CSV row as a list of strings, so option B is true. A csv.DictReader object reads each row into a dictionary, using field names as keys, so option D is also true. Option A is false because DictReader does not always take headers from the first row; field names can be provided explicitly through the fieldnames argument. Option C is false because DictWriter requires field names so it knows which dictionary keys correspond to CSV columns and in what order they should be written. This distinction between row lists and row dictionaries is central to CSV processing.
NEW QUESTION # 25
What is true about the following snippet of code?
class Cat:
def __init__(self, weight, sex):
self.height = height
self.weight = weight
self.sex = sex
def say(self):
print('meows')
kitty = Cat(1, 'male')
kitty.say()
Answer: C
Explanation:
The snippet raises a NameError because the variable height is referenced inside the constructor but is never defined. The __init__() method accepts only weight and sex as parameters, apart from self. When kitty = Cat(1, 'male') is executed, Python enters the constructor and evaluates self.height = height. Since there is no local variable, parameter, global variable, or built-in name called height, Python raises a NameError before the object is fully initialized. Because object construction fails, kitty.say() is never reached. The code does not print meows, and it does not raise ValueError, because the problem is not an invalid value but an undefined name.
NEW QUESTION # 26
Select the true statements about the following invocation:
(Select two answers.)
Answer: B,C
Explanation:
A). 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.
D). 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.
B). 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.
C). 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
NEW QUESTION # 27
Which of the following is not a widget property?
Answer: A
Explanation:
The correct answer is D. Tkinter widgets support many configuration options, and options such as width, underline, and highlightthickness are valid properties for relevant widgets. For example, width can define widget size, underline can specify which character should be underlined in text-based widgets, and highlightthickness controls the thickness of the focus highlight border. The option depth, however, is not a standard Tkinter widget configuration property. Tkinter widget options are specific names understood by the underlying Tk system, and unsupported names normally produce configuration errors when used. Therefore, among the listed options, depth is the one that does not belong as a Tkinter widget property.
NEW QUESTION # 28
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?"
Answer: C
Explanation:
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.
NEW QUESTION # 29
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