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質問 # 18
If purple can be obtained from mixing red and blue, which color codes represent the two ingredients? Select two answers)
- A. #0000FF
- B. #FF0000
- C. #000000
- D. #FFFFFF
正解：A、B
質問 # 19
Analyze the following snippet and select the statement that best describes it.
- A. The *arg parameter holds a list of unnamed parameters
- B. The code is syntactically correct despite the fact that the names of the function parameters do not follow the naming convention
- C. The code is missing a placeholder for unnamed parameters.
- D. The code is syntactically incorrect - the function should be defined as def f1 (*args, **kwargs)
正解：A
解説：
Explanation
The provided code snippet defines a function f1 that accepts variable-length arguments using the *args and **kwargs syntax. The *args parameter allows for an arbitrary number of unnamed arguments to be passed to the function as a tuple, while the **kwargs parameter allows for an arbitrary number of named arguments to be passed to the function as a dictionary.
Therefore, the correct statement that best describes the code is:
The *args parameter holds a list of unnamed parameters, while the **kwargs parameter holds a dictionary of named parameters.
質問 # 20
Which one of the following methods allows you to debug an XML tree in the xml.etree ELementTree module?
- A. debug
- B. parse
- C. log
- D. dump
正解：D
解説：
Explanation
The dump() method in the xml.etree.ElementTree module allows you to output a debug representation of an XML tree to a file or standard output. This method is useful for analyzing the structure of the tree and tracking down errors.
質問 # 21
The following snippet represents one of the OOP pillars Which one is that?
- A. Serialization
- B. Inheritance
- C. Encapsulation
- D. Polymorphism
正解：C
解説：
Explanation
The given code snippet demonstrates the concept of encapsulation in object-oriented programming.
Encapsulation refers to the practice of keeping the internal state and behavior of an object hidden from the outside world and providing a public interface for interacting with the object. In the given code snippet, the __init__ and get_balance methods provide a public interface for interacting with instances of the BankAccount class, while the __balance attribute is kept hidden from the outside world by using a double underscore prefix.
質問 # 22
Which of the following constants will be used if you do riot define the quoting argument in the writer method provided by the csv module?
- A. svQUOTE_ALL
- B. csv.QUOTE_NONNUMERIC
- C. csv.QUOTE_NONE
- D. csv.QUOTE_MINIMAL
正解：D
解説：
Explanation
If you do not define the quoting argument in the writer method provided by the csv module, the default quoting behavior is set to QUOTE_MINIMAL. This means that fields containing special characters such as the delimiter or newline character will be quoted, while fields that do not contain special characters will not be quoted.
質問 # 23
Select the true statements about the following invocation:
(Select two answers.)
- A. It addresses a service located at the following address local.host.com.
- B. It addresses a service deployed at localhost (the host where the code is run).
- C. It addresses a service listening at port 3000.
- D. It addresses a service whose timeout is set to 3000 ms.
正解：B、C
解説：
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
質問 # 24
In the JSON processing context, the term serialization:
- A. names a process in which a JSON string is turned into Python data.
- B. refers to nothing, because there is no such thing as JSON serialization.
- C. names a process in which a JSON string is remodeled and transformed into a new JSON string
- D. names a process in which Python data is turned into a JSON string.
正解：D
解説：
Explanation
In the JSON processing context, the term serialization: A. names a process in which Python data is turned into a JSON string.
Serialization refers to the process of converting a data object, such as a Python object, into a format that can be easily transferred over a network or stored in a file. In the case of JSON, serialization refers to converting Python data into a string representation using the JSON format. This string can be sent over a network or stored as a file, and later deserialized back into the original Python data object.
質問 # 25
What is true about the unbind () method? (Select two answers.)
- A. It needs a widget's object as an argument
- B. It needs the event name as an argument
- C. It is invoked from within the events object
- D. It is invoked from within a widget's object
正解：B、D
解説：
Explanation
Option B is true because the unbind() method is invoked from within a widget's object 1.
Option D is true because the unbind() method needs the event name as an argument 1.
The unbind() method in Tkinter is used to remove a binding between an event and a function. It can be invoked from within a widget's object when a binding is no longer needed. The method requires the event name as an argument to remove the binding for that specific event. For example:
button = tk.Button(root, text="Click me")
button.bind("<Button-1>", callback_function) # bind left mouse click event to callback_function button.unbind("<Button-1>") # remove the binding for the left mouse click event
質問 # 26
Which of the following values can be returnedby the messagebox. askquestion () method?
- A. True and False
- B. "accept:" and "cancel''
- C. l and o
- D. "yes" and "no"
正解：D
解説：
Explanation
The messagebox.askquestion() method in Python's tkinter library displays a message box with a specified question and two response buttons labeled "Yes" and "No". It returns a string indicating which button was selected - either "yes" or "no".
This function is used to ask questions to the user that have only two options: YES or NO. It can be used to ask the user if they want to continue or if they want to submit something 1.
質問 # 27
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?"
- A. The id () function
- B. The isinstanceO function
- C. The = operator
- D. The is operator
正解：D
解説：
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.
質問 # 28
Select the true statement about the socket. gaierror exception.
- A. It is raised when an address-related error caused by the getaddrinfo () and getnameinfo () functions occurs.
- B. It is raised when an address-related error caused by the repr () function occurs.
- C. It is raised when a system function returns a system-related error.
- D. It is raised when a timeout occurs on a socket.
正解：A
解説：
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.
質問 # 29
What is the result of the following code?
What is the result of the following code?
- A. Loading data...
- B. Nothing will be displayed
- C. Debugging mode has been enabled
- D. Debugging mode has been enabled Loading data...
正解：A
解説：
Explanation
This statement is true because the code uses the logging module to create a logger object and set its level to logging.INFO. The logging module provides a way of reporting events that occur during the execution of a program. The logging level determines which events are reported and which are ignored. The logging module defines five levels of severity: DEBUG, INFO, WARNING, ERROR, and CRITICAL. The lower the level, the more events are reported.
The code then uses the logger object to log two messages: one with the level logging.DEBUG and one with the level logging.INFO. The logger object only reports the messages that have a level equal or higher than its own level. Therefore, the message with the level logging.DEBUG is ignored, while the message with the level logging.INFO is reported. The default format for reporting messages is "level name: message". Therefore, the output of the code is:
INFO: Loading data...
質問 # 30
Select the true statement about the___name___attribute.
- A. __name___is a special attribute, which is inherent for classes and it contains information about the class to which a class instance belongs.
- B. __name___is a special attribute, which is inherent for classes, and it contains the name of a class.
- C. ___name is a special attribute, which is inherent for both classes and instances, and it contains a dictionary of object attributes.
- D. ___name___is a special attribute, which is inherent for both classes and instances, and it contains information about the class to which a class instance belongs.
正解：B
解説：
Explanation
The true statement about the __name__ attribute is D. name is a special attribute, which is inherent for classes, and it contains the name of a class. The __name__ attribute is a special attribute of classes that contains the name of the class as a string.
The __name__ attribute is a special attribute in Python that is available for all classes, and it contains the name of the class as a string. The __name__ attribute can be accessed from both the class and its instances using the dot notation.
質問 # 31
What will happen if the mamwindow is too small to fit all its widgets?
- A. The widgets will be scaled down to fit the window's size.
- B. Some widgets may be invisible
- C. An exception will be raised.
- D. The window will be expanded.
正解：B
解説：
Explanation
If the main window is too small to fit all its widgets, some widgets may be invisible. So, the correct answer is Option A.
When a window is not large enough to display all of its content, some widgets may be partially or completely hidden. The window will not automatically expand to fit all of its content, and no exception will be raised. The widgets will not be automatically scaled down to fit the window's size.
If the main window is too small to fit all its widgets, some of the widgets may not be visible or may be partially visible. This is because the main window has a fixed size, and if there are more widgets than can fit within that size, some of them will be outside the visible area of the window.
To avoid this issue, you can use layout managers such as grid, pack, or place to dynamically adjust the size and position of the widgets as the window changes size. This will ensure that all the widgets remain visible and properly arranged regardless of the size of the main window.
References:
* https://www.tkdocs.com/tutorial/widgets.html#managers
* https://www.geeksforgeeks.org/python-tkinter-widgets/
* https://anzeljg.github.io/rin2/book2/2405/docs/tkinter/introduction.html
質問 # 32
What is a static method?
- A. A method that works on class objects that are instantiated
- B. A method decorated with the @method trait
- C. A method that works on the class itself
- D. A method that requires no parameters referring to the class itself
正解：D
解説：
Explanation
A static method is a method that belongs to a class rather than an instance of the class. It is defined using the @staticmethod decorator and does not take a self or cls parameter. Static methods are often used to define utility functions that do not depend on the state of an instance or the class itself.
質問 # 33
Select the true statement related to PEP 257.
- A. Attribute docstrings and Additional docstrings are two types of extra docstrings that can be extracted by software tools.
- B. String literals that occur immediately after a simple assignment at the top level of a module are called complementary docstrings
- C. String Iiterals that occur in places other than the first statement in a module, function, or class definition can act as documentation They are recognized by the Python bytecode compiler and are accessible as runtime object attributes
- D. String literals that occur immediately after another docstring are called attribute docstrings.
正解：A
解説：
Explanation
The true statement related to PEP 257 is Option B. According to PEP 257, string literals occurring elsewhere in Python code may also act as documentation. They are not recognized by the Python bytecode compiler and are not accessible as runtime object attributes (i.e. not assigned to doc), but two types of extra docstrings may be extracted by software tools: String literals occurring immediately after a simple assignment at the top level of a module, class, or init method are called "attribute docstrings". String literals occurring immediately after another docstring are called "additional docstrings"1.
質問 # 34
Select the true statements about the sqirte3 module. (Select two answers.)
- A. The special name memory is used to create a database in RAM.
- B. The sqlite3 module provides an interface compliant with the DB-API 2.0.
- C. The fetchall method returns an empty list when no rows are available
- D. The sqhte3 module does not support transactions.
正解：A、B
解説：
Explanation
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.
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.
質問 # 35
Analyze the following snippet and choose the best statement that describes it.
- A. Excalibur is the value passed to an instance variable
- B. Weapon is the value passed to an instance variable
- C. varl is the name of a global variable
- D. self. name is the name of a class variable.
正解：A
解説：
Explanation
The correct answer is C. Excalibur is the value passed to an instance variable. In the given code snippet, self.name is an instance variable of the Sword class. When an instance of the Sword class is created with varl = Sword('Excalibur'), the value 'Excalibur' is passed as an argument to the __init__ method and assigned to the name instance variable of the varl object.
The code defines a class called Sword with an __init__ method that takes one parameter name. When a new instance of the Sword class is created with varl = Sword('Excalibur'), the value of the 'Excalibur' string is passed as an argument to the __init__ method, and assigned to the self.name instance variable of the varl object.
質問 # 36
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