Which Flask function is used to start the development server of a Flask application?
- begin()
- launch()
- run()
- start()
The correct function to start the development server in Flask is run(). This function is typically called at the end of a Flask script to launch the server and make the web application accessible.
Which command is used in PDB (Python Debugger) to continue execution until the next breakpoint is encountered?
- c
- continue
- go
- next
In the Python Debugger (PDB), you can use the continue command to resume execution of your code until the next breakpoint is encountered. This allows you to step through your code and examine its behavior.
Which data structure follows the Last In First Out (LIFO) principle?
- Array
- Linked List
- Queue
- Stack
A stack is a data structure that follows the Last In First Out (LIFO) principle. It means that the last element added to the stack will be the first one to be removed. Stacks are commonly used in programming for tasks like tracking function calls and managing memory.
Which data structure in Python would you use to store a collection of unique elements?
- Dictionary
- List
- Set
- Tuple
You would use a Set in Python to store a collection of unique elements. Sets do not allow duplicate values, and they are commonly used to work with unique items. Lists (option 1) and Tuples (option 2) allow duplicate elements, and Dictionaries (option 4) store key-value pairs.
Which data structure would be the most appropriate to implement a priority queue?
- Array
- Binary Heap
- Hash Table
- Linked List
A binary heap is the most appropriate data structure to implement a priority queue because it allows efficient insertion and extraction of elements with logarithmic time complexity.
When integrating a Python back-end with a front-end form, how can you secure the application against Cross-Site Request Forgery (CSRF) attacks?
- Disable JavaScript to prevent malicious form submissions.
- Use a unique token with each form submission and verify it on the server.
- Use HTTPS to encrypt form data.
- Validate user input on the front-end before submission.
To secure an application against CSRF attacks, you should use a unique token (CSRF token) with each form submission. This token is generated on the server and verified on the server to ensure that the request is legitimate and not forged by a malicious attacker.
When optimizing Python code, why is it essential to consider the algorithmic complexity of your solutions?
- Algorithmic complexity only matters for other programming languages, not Python.
- It helps you write faster code by choosing algorithms that have better time complexity.
- It makes your code longer and more complex.
- It's not necessary; you can optimize code without worrying about algorithmic complexity.
Considering algorithmic complexity is crucial because it determines how efficiently your code runs as the input size grows. Choosing algorithms with better time complexity can significantly improve performance.
When preprocessing data, the ____ class in Scikit-learn is used to encode categorical features as a one-hot numeric array.
- LabelEncoder
- OneHotEncoder
- PCA
- StandardScaler
In Scikit-learn, the OneHotEncoder class is used to transform categorical features into a one-hot encoded numeric array. This process is essential when working with machine learning algorithms that require numeric input, as it converts categorical data into a format that the algorithms can understand.
When should you consider using HTTP long-polling in designing RESTful APIs?
- A. When real-time updates are required
- B. For caching static content
- C. To minimize latency in request-response cycles
- D. When working with large file uploads
A. HTTP long-polling is suitable when you need real-time updates from the server. It involves keeping a connection open until new data is available, making it suitable for applications like chat or notifications. Options B, C, and D are not appropriate use cases for long-polling.
When using decorators, what is the significance of the functools.wraps function?
- It is not related to decorators.
- It is used to define custom decorators.
- It is used to wrap a function multiple times.
- It's used to create a wrapper function that preserves metadata like function name and docstring when decorating a function.
The functools.wraps function in Python is often used when creating decorators. It helps preserve the metadata of the original function (e.g., name and docstring) when decorating it with another function. This ensures that the decorated function retains its identity and documentation.