Which of the following is not typically a use case for the with statement in Python?
- Creating a context manager
- Managing database connections
- Opening and closing files
- Performing arithmetic calculations inside a loop
The with statement is typically used for resource management, such as file handling or database connections. It is not meant for performing arithmetic calculations.
What's the primary benefit of using tuples as keys in dictionaries over lists?
- Tuples are faster to access.
- Tuples are immutable.
- Tuples are more memory-efficient.
- Tuples guarantee order.
The primary benefit of using tuples as keys in dictionaries is that tuples are immutable, while lists are not. This immutability ensures that the keys won't change, making tuples suitable for use as dictionary keys. Lists can't be used as keys because they can change.
_______ is a built-in Python function that dynamically loads a module into the current namespace.
- import
- include
- load
- require
The import statement is used to dynamically load a module into the current Python namespace. It allows you to access functions, classes, and variables defined in the imported module. This dynamic loading is crucial for code modularity and reusability, enabling you to use code from different modules in your Python programs.
If you want to overload the less than (<) operator for a class, you will define the _______ method in your class.
- __compare__
- __less__
- __lessthan__
- __lt__
To overload the less than (<) operator for a class, you define the __lt__ (less than) method in your class. This method is called when the "<" operator is used with objects of the class.
When importing a module, what is the primary purpose of using the as keyword?
- To create an alias for the module
- To hide the module's functions
- To prevent the module from being imported again
- To specify the module's version
The 'as' keyword is used to create an alias for a module when importing it. This alias can make it easier to reference the module in your code, especially if the module name is long or conflicts with other names in your script.
You have a function that needs to return multiple values, which data structure is more commonly used for such a purpose?
- Dictionary
- List
- Set
- Tuple
Tuples are commonly used to return multiple values from a function because they are immutable (cannot be changed), ensuring data integrity. This makes them a safer choice than lists, which are mutable. Using a tuple also communicates that the returned values should not be modified.
You can use the 'try...finally' block in Python to ensure that the database connection is always closed.
- Implement a custom function to manage connections
- Manually close the connection in each place
- Rely on Python's automatic garbage collection
- Use a context manager like 'with' statements
The 'try...finally' block ensures that the database connection is closed even if an exception occurs. It's a robust way to manage resource cleanup.
Which Python data type is used to represent whole numbers?
- bool
- float
- int
- str
The 'int' data type in Python is used to represent whole numbers, both positive and negative, without any fractional part.
What do you call a function defined inside another function in Python?
- Child function
- Inner function
- Nested function
- Sub function
A function defined inside another function in Python is called an 'Inner function' or 'Nested function.' They have access to the variables of the enclosing function.
Which keyword is used in Python to check a condition?
- check
- if
- then
- verify
In Python, the 'if' keyword is used to check a condition. It allows you to execute a block of code if the condition is true.