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| Section | Weight | Objectives |
|---|---|---|
| Python Standard Library and Best Practices | 10% | - Advanced Python development
|
| Advanced Object-Oriented Programming | 25% | - Object-oriented concepts
|
| File Processing and Serialization | 15% | - Data storage and transfer
|
| Multithreading and Concurrency | 10% | - Concurrent programming
|
| Network Programming | 20% | - Communication and networking
|
| GUI Programming | 20% | - Graphical user interfaces with Tkinter
|
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NEW QUESTION # 13
Which sentence about the property decorator is false?
Answer: A
Explanation:
Explanation
The @property decorator should be defined after the method that is responsible for setting an encapsulated attribute is a false sentence. In fact, the @property decorator should be defined before the method that is used to set the attribute value. The @property decorator and the setter and deleter methods work together to create an encapsulated attribute, which is used to provide control over the attribute's value.
NEW QUESTION # 14
What is true about the unbind_all () method?
(Select two answers.)
Answer: B,C
Explanation:
The unbind_all() method in Tkinter is used to remove all event bindings from a widget. It is a method of the widget object and can be called on any widget in the Tkinter application. Therefore, option A is the correct answer.
Option B is incorrect because the method can be called on any widget, not just the main window widget.
Option C is correct as unbind_all() does not take any parameters.
Option D is incorrect because the method only removes event bindings and does not cause the widgets to disappear.
So, the correct answers are A and C.
References:
Tkinter documentation: https://docs.python.org/3/library/tkinter.html#event-bindings Tkinter tutorial: https://www.python-course.eu/tkinter_events_binds.php
NEW QUESTION # 15
What is a___traceback___?
(Select two answers )
Answer: C,D
Explanation:
The correct answers are A. An attribute owned by every exception object and D. An attribute that holds interesting information that is particularly useful when the programmer wants to store exception details in other objects . A traceback is an attribute of an exception object that contains a stack trace representing the call stack at the point where the exception was raised. The traceback attribute holds information about the sequence of function calls that led to the exception, which can be useful for debugging and error reporting.
NEW QUESTION # 16
If w is a correctly created main application window, which method would you use to foe both of the main window's dimensions?
Answer: C
Explanation:
C). w.resizable()
The resizable() method takes two Boolean arguments, width and height , that specify whether the main window can be resized in the corresponding directions. Passing False to both arguments makes the main window non-resizable, whereas passing True to both arguments (or omitting them) makes the window resizable.
Here is an example that sets the dimensions of the main window to 500x400 pixels and makes it non-resizable:
import tkinter as tk
root = tk. Tk ()
root. geometry ( "500x400" )
root. resizable (False, False)
root. mainloop ()
References:
Tkinter documentation: https://docs.python.org/3/library/tk.html
Tkinter tutorial: https://www.python-course.eu/python_tkinter.php
The resizable () method of a tkinter window object allows you to specify whether the window can be resized by the user in the horizontal and vertical directions. You can pass two boolean arguments to this method, such as w.resizable (False, False), to prevent both dimensions from being changed. Alternatively, you can pass 0 or 1 as arguments, such as w.resizable (0, 0), to achieve the same effect 1 .
References:
1 : https://stackoverflow.com/questions/36575890/how-to-set-a-tkinter-window-to-a-constant-size Other methods that can be used to control the window size are:
w.geometry () : This method allows you to set the initial size and position of the window by passing a string argument in the format "widthxheight+x+y", such as w.geometry ("500x500+100+100") 1 2 .
w.minsize () and w.maxsize (): These methods allow you to set the minimum and maximum size of the window in pixels, such as w.minsize (500, 500) and w.maxsize (1000, 1000) 1 2 .
w.pack_propagate () and w.grid_propagate (): These methods allow you to enable or disable the propagation of the size of the widgets inside the window to the window itself. By default, these methods are set to True, which means that the window will adjust its size according to the widgets it contains. You can set these methods to False or 0 to prevent this behavior, such as w.pack_propagate (0) or w.grid_propagate (0).
w.place (): This method allows you to place the window at a specific position and size relative to its parent window or screen. You can use keyword arguments such as x, y, width, height, relx, rely, relwidth, and relheight to specify the coordinates and dimensions of the window in absolute or relative terms, such as w.
place (x=0, y=0, relwidth=1, relheight=1).
References:
2 : https://stackoverflow.com/questions/25690423/set-window-dimensions-in-tkinter-python-3 :
https://stackoverflow.com/questions/36575890/how-to-set-a-tkinter-window-to-a-constant-size
/36576068#36576068 : https://www.skotechlearn.com/2020/06/tkinter-window-position-size-center-screen-in- python.html
NEW QUESTION # 17
What does the term deserialization mean? Select the best answer.
Answer: D
Explanation:
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:
import json
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.
Reference:
Official Python Documentation on Serialization: https://docs.python.org/3/library/pickle.html#module-pickle Real Python Tutorial on Serialization and Deserialization in Python: https://realpython.com/python- serialization/ Deserialization is the process of converting a sequence of bytes, such as a file or a network message, into a Python object. This is the opposite of serialization, which is the process of converting a Python object into a sequence of bytes for storage or transmission.
NEW QUESTION # 18
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