Library Modules

You are using the logging module in a long-running service. You need to ensure that a specific logger named 'app.db' writes DEBUG and higher messages to a file, but its parent logger 'app' must not propagate these DEBUG messages to the root logger. Which configuration achieves this?

What is the purpose of the logging.StreamHandler?

You are developing a Python application that must parse a large XML file and extract specific data. The file is too large to fit into memory, so you need to process it incrementally. Which approach using the xml.etree.ElementTree module is most appropriate?

When using configparser, how do you retrieve a value as a boolean?

You are using the `json` module to serialize a custom object that contains a `datetime.date` attribute. When you call `json.dumps(obj)`, you get a `TypeError: Object of type date is not JSON serializable`. Which approach correctly allows serialization while preserving the date as an ISO 8601 string?

You are writing a script that reads a large CSV file using csv.reader. The file uses a semicolon as the delimiter and contains quoted fields with embedded newlines. Which instantiation correctly handles this format?

You are writing a Python application that must parse a configuration file where a value spans multiple lines, such as a long list of email addresses separated by newlines. You decide to use the configparser module. Which of the following correctly describes how to include a multi-line value in the configuration file?

You are logging events with custom levels. How do you add a custom level 'TRACE' (value 5) to the logging module?

In the context of the CSV module, what is a 'dialect'?

You are working with a large XML file and need to extract specific elements efficiently without loading the entire document into memory. You decide to use the xml.etree.ElementTree module. Which of the following methods should you use to iterate over all 'book' elements in the document?

When using configparser, what happens if you attempt to read a configuration file that does not exist using the read() method?

You are writing a Python script that must process a large text file line by line. The file is UTF-8 encoded, but some lines contain characters that are not representable in the default system encoding. You want to ensure that the script reads the file correctly on any platform. Which code correctly opens the file?

Which TWO of the following are valid ways to define a configuration option in configparser?

You are writing to a CSV file. If your data contains the delimiter character itself (e.g., a comma in a text field), what does the csv module do by default?

You are using the csv module to read a file that contains fields with embedded newlines and commas. Which TWO of the following statements about the csv.reader are correct? (Choose two.)

When parsing XML with ElementTree, how do you retrieve the text content of an element?

You are building a Python application that uses the shelve module to store persistent data. You want to ensure that the database file is updated correctly and that you can access keys as attributes. Which TWO of the following statements about the shelve module are true? (Choose two.)

A colleague's script parses a CSV export that uses a semicolon as the field separator and contains quoted text fields with embedded semicolons. They call csv.reader(f) without arguments and complain that rows are split incorrectly into too many fields. What is the correct fix?

Which THREE of the following are valid parameters for the csv.writer constructor?

You are writing a Python script that must read a configuration file in TOML format. Which module from the Python Standard Library should you use?

You are working with the sqlite3 module to build a small inventory application. You need to execute a parameterized INSERT statement and then retrieve the auto-generated primary key for the newly inserted row. Which two approaches are valid and safe? (Choose two.)

You are writing a reusable module that must expose only a small public API while keeping several helper functions and constants internal. Users of the module should not import the helpers with 'from mymodule import *', but direct access such as mymodule._helper() may still be needed for tests. Which approach fits best?

You are writing a Python script that needs to create a temporary directory, write several files into it, and ensure that the directory and its contents are automatically deleted when the script exits, even if an exception occurs. Which approach using the tempfile module is most appropriate?

You are using configparser and want to access a value that might not exist, but provide a default value if it is missing. Which method is most appropriate?

When executing a SQL query with parameters in sqlite3, why should you use placeholders (e.g., ?) rather than f-strings?

You are using the datetime module to calculate the difference between two dates. You have two datetime objects, start and end, and you need to find the number of full days between them, ignoring any fractional part. Which expression correctly computes this?

You are using the sqlite3 module to insert a large number of rows into a table. You want to maximize performance by reducing the number of disk writes. Which approach is most effective?

Which THREE of the following are valid methods of the xml.etree.ElementTree.Element class?

You are using the sqlite3 module to manage a database. You need to ensure that database changes are permanently saved even if your script terminates unexpectedly. Which method should you call after an INSERT operation?

Which TWO of the following are valid ways to create a connection in the sqlite3 module?

In the csv module, how do you specify that the CSV file uses a semicolon (;) as a delimiter?

Which method in the xml.dom.minidom module is used to retrieve the value of a specific attribute of an element?

You want to execute multiple SQL statements at once in sqlite3. Which method should you use?

You are writing a Python utility that copies a directory tree to a network share using shutil. You must preserve file metadata and fail loudly if the destination already contains a conflicting file, rather than silently overwriting it. Which TWO shutil features satisfy these requirements? (Choose two.)

You are building a desktop tool with tkinter. A user clicks a button, and while a long file-compression routine runs you want a small window with a progress bar to stay visible and animated; the main application window must remain responsive to the user's clicks throughout. Which approach should you use?

You are building a Python script that needs to create a ZIP archive containing files from a directory. You want to preserve the directory structure inside the archive. Which approach using the zipfile module correctly adds the file '/data/reports/summary.txt' as 'reports/summary.txt' inside the archive?

When using configparser, how do you handle multiline values?

When using sqlite3.Row, what is the primary benefit over using a standard tuple?

You are configuring a logging FileHandler. What does the 'mode' parameter control?

Which TWO of the following are required to successfully write a row to a CSV file?

You are developing a Python script that needs to determine the absolute path of a file located in a directory relative to the script's location. You decide to use the os.path module. Which of the following functions should you use to obtain the absolute path without resolving symbolic links?

You are using configparser.ConfigParser to read a configuration file. You have a file where option names are case-sensitive. How do you ensure the parser respects this casing?

You are configuring logging using a dictConfig. You want to send logs to a RotatingFileHandler. Which key must you define in the 'handlers' section?

You need to configure the logging module to capture logs from multiple modules while ensuring that logs from third-party libraries (e.g., 'urllib3') are only captured at the WARNING level. How do you set this?

You are building a configuration manager that reads an INI file. A section contains the key-value pair `timeout = 30`. You need to retrieve the value as an integer, but if the key is missing, you want to get 60 without raising an exception. Which code snippet achieves this using the `configparser` module?

You are processing a CSV file using csv.DictReader. If your input file lacks a header row, how do you provide the field names?

You are using sqlite3 and need to enforce foreign key constraints. How do you enable them?

Which TWO of the following are true about the sqlite3.Cursor object?