PCPP-32-101資料勉強、PCPP-32-101テスト難易度

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Python Institute PCPP1 - Certified Professional in Python Programming 1 認定 PCPP-32-101 試験問題 (Q56-Q61):

質問 # 56
What is ElementTree?

A. A Python built-in module that contains functions used for creating HTML files.
B. A Python library that contains an API used for parsing and manipulating JSON files.
C. A Python built-in module that contains functions used for parsing and creating XML data.
D. A Python library that contains functions and tools used for manipulating text files in GUI Programming.

正解：C

解説：
Explanation
ElementTree is a Python built-in module that provides a simple and efficient API for parsing and creating XML data. It allows you to access and manipulate XML data in a very straightforward way, making it easy to write XML processing applications.

質問 # 57
What is a static method?

A. A method that requires no parameters referring to the class itself
B. A method that works on class objects that are instantiated
C. A method that works on the class itself
D. A method decorated with the @method trait

正解：A

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 # 58
What is true about the unbind_all () method?
(Select two answers.)

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

正解：A、C

解説：
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

質問 # 59
Select the true statements related to PEP 8 programming recommendations for exception handling. (Select two answers.)

A. You should derive exceptions from the Exception class, rather than from the BaseException class.
B. You should generally use "bare" except: clauses, as they will not catch SystemExit and KeyboardInterrupt exceptions, making it more difficult to interrupt a program using keyboard shortcuts.
C. When designing exception hierarchies, you should focus on stating that a problem occurred, rather than programmatically trying to answer the question about what actually went wrong.
D. You should generally limit the use of a "bare" except: clause and, whenever possible, use specific exceptions instead.

正解：A、D

解説：
The correct answers are C and D. Custom application exceptions should normally inherit from Exception, not directly from BaseException. BaseException is intended for system-exiting exceptions such as SystemExit, KeyboardInterrupt, and GeneratorExit, so deriving ordinary errors from it can interfere with normal control flow. PEP 8 also discourages broad or bare except: clauses because they catch too much and can hide programming errors or prevent expected interruption behavior. Specific exception handling is clearer, safer, and easier to debug. Option A reverses the intended guidance:
exception hierarchies should help code distinguish what went wrong programmatically. Option B is false because a bare except: can catch system-level exceptions, which is exactly why it should be avoided.

質問 # 60
Which of the following types cannot be pickled?

A. None, booleans
B. function and class definitions
C. strings, bytes, bytearrays
D. integers, floating-point numbers, complex numbers

正解：B

解説：
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.

質問 # 61
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