Airlines come and go. Some operate for only a few years befo…
Airlines come and go. Some operate for only a few years before financial pressures force them to close; others endure for decades, surviving recessions, deregulation, fuel crises, and pandemics. The airlines.csv file (right-click, open in new tab or window) contains information about commercial airlines from around the world. The columns are labeled in the file. The ceased column contains 0 for airlines still operating at the time the data file was compiled. Write a function named top_carriers that accepts four arguments: a file name, a beginning year, an ending year, and a number n. Return a 2-dimensional NumPy array containing the name and country of the n longest-operating (defined as ceased – founded) airlines that ceased operations between the beginning year and ending year (inclusive). Include in your analysis only those airlines whose operations have ended. For full credit, your function should use NumPy concepts and techniques to calculate and return the result without using loops or list comprehensions. In [1]: top_carriers(‘airlines.csv’, 1920, 2025, 3) Out[1]: array([[‘Czech Airlines’, ‘Czech Republic’], [‘Mexicana’, ‘Mexico’], [‘Northwest Airlines’, ‘USA’]], dtype=’
Read DetailsYou are designing a system where objects need to be composed…
You are designing a system where objects need to be composed into tree structures to represent part-whole hierarchies (e.g., a file system with folders and files). Both individual objects and groups of objects should be treated uniformly. Which pattern is most appropriate?
Read DetailsYou are developing a cross-platform mobile app. You want to…
You are developing a cross-platform mobile app. You want to ensure that the UI elements (buttons, menus, dialogs) look and behave appropriately on both iOS and Android, but the client code should not depend on platform-specific classes. Which pattern allows you to create families of related objects without specifying their concrete classes?
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