In Python, the base class is also commonly referred to as the _______ class.
- Main
- Parent
- Root
- Super
In Python, the base class is commonly referred to as the "Super" class. The "super" keyword is used to access and call methods or attributes from the base class within the derived class.
You are given a list of words and you need to create a dictionary where keys are words and values are their respective lengths. Which Python construct will be most efficient for this?
- word_lengths = {word: len(word) for word in words}
- word_lengths = {} for i in range(len(words)): word_lengths[words[i]] = len(words[i])
- word_lengths = {} for word in words: word_lengths[word] = len(word)
- word_lengths = {} len(words, key=lambda x: word_lengths[word])
The most efficient way to create a dictionary with words as keys and their respective lengths as values is to use a dictionary comprehension. It is concise and Pythonic, iterating over the list of words and calculating the length of each word in a single step.
How can you access a method from a base class in a derived class if the method is overridden in the derived class?
- By redefining the base class method in the derived class
- By using the 'base' keyword
- By using the 'super()' function
- You cannot access the base class method
To access a method from a base class that is overridden in the derived class, you can use the 'super()' function. This allows you to call the base class method explicitly and execute its code alongside the derived class method. It's a common practice when you want to extend the functionality of the base class method in the derived class without completely replacing it.
If you have a function named fun inside a module named mod, how can you import it directly?
- from mod import fun
- fun(mod)
- import fun from mod
- include mod.fun
To import a specific function from a module, you use the syntax from mod import fun. This allows you to use fun directly in your code.
Which built-in function in Python can be used to get the data type of an object?
- dtype()
- type()
- typeof()
- typeofobject()
The type() function is used to determine the data type of an object in Python. It returns a type object, which represents the data type of the given object.
Which of the following decorators is used to define a setter method for a property in Python?
- @getter
- @property
- @setter
- @setter and @getter
The @property decorator is used to define a getter method for a property. To define a setter, you would use @.setter.
What happens if the base class method is private, and you try to override it in a derived class?
- Compilation error
- The base class method is called
- The derived class method is overridden
- The derived class method is private
If the base class method is private, it cannot be overridden in the derived class. Attempting to do so will result in a compilation error, as private methods are not accessible outside the class.
In the context of method overloading, what does the *args syntax in Python signify?
- It represents default argument values
- It represents keyword arguments in a function signature
- It signifies that the function accepts a variable-length non-keyword argument list
- It signifies that the function cannot accept any arguments
In Python, the *args syntax in a function signature indicates that the function accepts a variable-length non-keyword argument list. This allows you to pass a varying number of positional arguments to the function. It's commonly used in method overloading to handle multiple argument scenarios.
You have a program that checks for a user's age to determine the price of a movie ticket. How would you structure the conditional statements to determine if a user gets a discount based on their age?
- if age < 10 or age > 65:
- if age == 10 or age == 65:
- if age > 10 and age < 65:
- if age >= 10 and age <= 65:
To determine if a user gets a discount based on age, you should use 'if' statements with logical OR operators. This way, you can identify both children under 10 and seniors above 65 who are eligible for a discount.
A program is intended to print all even numbers between 1 to 10 but instead, it prints all numbers between 1 to 10. What control structure might be missing or misused?
- Conditional Statement
- For Loop
- Range Function
- While Loop
If a program is printing all numbers between 1 to 10 instead of just even numbers, a conditional statement might be missing or misused. Conditional statements are used to specify different actions based on certain conditions, and they are essential for filtering and printing even numbers in this case.
What are the limitations of using a modified Z-score for outlier detection?
- It assumes data is normally distributed
- It cannot handle missing values
- It is sensitive to extreme values
- It uses median instead of mean, which may not always be appropriate
A limitation of the modified Z-score is that it uses the median and MAD instead of the mean and standard deviation, which may not always be appropriate, especially for normally distributed data.
What is the key purpose of Predictive Modeling in data analysis?
- To confirm a pre-existing hypothesis
- To generate future data
- To make predictions based on the data
- To understand the underlying structure of the data
The key purpose of predictive modeling is to make predictions based on the data. Using various statistical techniques and machine learning algorithms, predictive modeling enables analysts to predict future outcomes based on historical data.