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Python Institute PCPP1 - Certified Professional in Python Programming 1 Sample Questions (Q27-Q32):

NEW QUESTION # 27
What will happen if the mamwindow is too small to fit all its widgets?

A. An exception will be raised.
B. Some widgets may be invisible
C. The widgets will be scaled down to fit the window's size.
D. The window will be expanded.

Answer: B

Explanation:
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

NEW QUESTION # 28
Select the true statement about PEP 8 recommendations related to line breaks and binary operators.

A. It is permissible to use line breaks before or after a binary operator as long as the convention is consistent locally However, for new code it is recommended that break lines should be used only after binary operators.
B. It is recommended that you use line breaks before binary operators to improve code readability.
C. It is recommended that you use line breaks after binary operators to improve code readability.
D. There is no specific PEP 8 recommendation related to using line breaks with binary operators.

Answer: B

Explanation:
Explanation
According to PEP 8, Python's official style guide, line breaks before binary operators produce more readable code, especially in code blocks with long expressions. This is stated in several sources (1,2,6,8) and is a widely accepted convention.
References:
* https://www.python.org/dev/peps/pep-0008/#should-a-line-break-before-or-after-a-binary-operator
* https://stackoverflow.com/questions/30614124/are-long-lines-broken-up-before-or-after-binary-operators-
* https://www.quora.com/What-is-PEP-8-Python
* https://www.techbeamers.com/python-tutorial-pep-8/
* https://www.section.io/engineering-education/python-coding-conventions-guidelines-for-python-programm
* https://towardsdatascience.com/a-step-in-pep8-style-guide-improving-the-readability-of-the-code-8114fd4
* https://www.codementor.io/@rishikeshdhokare/python-coding-style-best-practices-that-every-python-prog
* https://www.dataschool.io/python-pep8-tips-and-tricks/

NEW QUESTION # 29
Look at the following code snippets and decide which ones follow PEP 8 recommendations for whitespacesin expressions and statements(Select two answers.)

A. A whitespace immediately before a comma,semicolon, and colon:
B. A whitespace immediately after the opening parenthesis that starts indexing or slicing:
C. No whitespace immediately before the opening parenthesis that starts the list of arguments of a function call:
D. No whitespace between a trailing comma and a following closing parenthesis:

Answer: C,D

Explanation:
Explanation
Option A is true because PEP 8 recommends avoiding extraneous whitespace immediately inside parentheses, brackets or braces 1.
Option C is true because PEP 8 recommends avoiding extraneous whitespace between a trailing comma and a following close parenthesis 1.

NEW QUESTION # 30
Select the true statements about sockets. (Select two answers)

A. A socket can be used to establish a communication endpoint for processes running on the same or different machines.
B. A socket is always the secure means by which computers on a network can safely communicate, without the risk of exposure to an attack
C. A socket is a connection point that enables a one-way communication only between remote processes
D. A socket is a connection point that enables a two-way communication between programs running in a network.

Answer: A,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 # 31
What is true about the unbind_all () method?
(Select two answers.)

A. It can be invoked from any widget
B. It causes all the widgets to disappear
C. It can be invoked from the main window widget only
D. It is parameterless

Answer: A,D

Explanation:
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 # 32
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