You are developing a banking software, and you need to ensure that no withdrawal exceeds the account balance. Which approach would be the most appropriate to handle such a situation?
- Apply logging mechanisms to track withdrawal attempts without enforcing strict limits.
- Implement try-except blocks to catch and handle withdrawal exceptions.
- Rely on user input validation to prevent invalid withdrawals.
- Use conditional statements to check the withdrawal amount against the account balance.
The most appropriate approach is to use try-except blocks to catch and handle withdrawal exceptions. This allows for precise error handling and ensuring that withdrawals do not exceed the account balance, maintaining data integrity.
In Python, a class member prefixed with two underscores, such as __memberName, is conventionally considered as _______.
- Private Member
- Public Member
- Protected Member
- Hidden Member
In Python, a class member prefixed with two underscores (e.g., __memberName) is conventionally considered a "private" member. It's a way to indicate that the member should not be accessed directly from outside the class.
What is the primary role of the else block in a conditional statement?
- To define a new condition
- To define the default action
- To end the statement
- To specify the condition
The primary role of the 'else' block in a conditional statement is to define the default action to be taken when none of the preceding conditions is true. It provides an alternative execution path.
How can default argument values be used to achieve method overloading in Python?
- Python doesn't support method overloading
- By defining multiple methods with the same name but different argument signatures
- By using the @overload decorator
- By using the __overload__() method
In Python, method overloading is achieved by defining multiple methods with the same name but different argument signatures. Default argument values can be used to provide different options for the number or type of arguments, allowing a single method to handle multiple cases.
For supporting operations like obj[key], the class should define the _______ method.
- __getitem__
- __getkey__
- __getvalue__
- __index__
To support operations like obj[key] for custom objects, you should define the __getitem__ method in the class. This method is called when you use square brackets to access an item in the object.
How can you make a single class work with multiple with statement contexts simultaneously?
- By implementing both enter and exit methods
- By nesting with statements inside each other.
- By using the 'as' keyword followed by a custom context manager.
- This is not possible in Python.
To make a single class work with multiple with statement contexts simultaneously, you need to implement both the enter and exit methods in the class. This allows you to manage multiple contexts effectively.
Tuples can be used as keys in dictionaries because they are _______.
- Hashable
- List-like
- Ordered
- Unchangeable
Tuples can be used as keys in dictionaries because they are hashable, which means their contents do not change, making them suitable for dictionary keys.
When reading a file in text mode in Python, what does the file method readline() return?
- A boolean indicating EOF
- A line of text
- A list of lines in the file
- The entire file contents
In Python, when you use the readline() method in text mode, it returns a line of text from the file, up to and including the newline character 'n'.
To iterate over a list in reverse order using a for loop, one can use the _______ method of the list.
- append()
- extend()
- reverse()
- sort()
To iterate over a list in reverse order using a for loop, you can use the reverse() method, which reverses the elements in the list in place, allowing you to traverse it in reverse order.
Which of the following is a default method executed when a new instance of a class is created?
- create()
- init()
- main()
- new()
The 'init()' method, also known as the constructor, is executed automatically when a new instance of a class is created. It initializes object attributes.