http://ocw.cs.pub.ro/courses/ 2026-06-05T09:32:18+03:00 http://ocw.cs.pub.ro/courses/ http://ocw.cs.pub.ro/courses/lib/tpl/arctic/images/favicon.ico text/html 2024-03-15T13:30:17+03:00 http://ocw.cs.pub.ro/courses/ii/labs/s2/01/tasks/01?rev=1710502217&do=diff 01. [25p] String manipulation First, let's familiarize ourselves with Python's string type: * Read a string input from the user's console (hint: input()); next sub-tasks will use this value and apply various string transformations on it; * Print the reversed string (e.g., “hello world” => “dlrow olleh”); hint: there are at least 3 built-in ways to do this in a single line of code ;) * Print the same string in “aLtErNaTe CaSe” (if you're out of ideas, simply use the for loop); * Finally… text/html 2024-03-15T13:30:24+03:00 http://ocw.cs.pub.ro/courses/ii/labs/s2/01/tasks/02?rev=1710502224&do=diff 02. [25p] Let's do the math! Python is also popular for its numeric manipulation features (it can handle very large numbers!). Let's find out: * Read a number from the console (you should know how to do it by now; don't forget to convert it to an int!); * Reverse the number's digits and print the result (e.g., 13568 => 86531)! * Define a new function, generate_prime(k), which takes in an argument and will generate a prime number of exactly k digits; use it to generate a 15-digit prime nu… text/html 2024-03-15T13:30:33+03:00 http://ocw.cs.pub.ro/courses/ii/labs/s2/01/tasks/03?rev=1710502233&do=diff 03. [25p] Making the list Solve these subtasks all in the same file (use print() statements to display the results): Use the following list: sample = ["a", 90, 8, "X55", "1z", 102, "asdf", 65, 10, "word", "567", 567] Well: * Sort the list (does it work? if not, why?); * Reverse the list (this again? note: save the original one!); * Filter out all non-numbers from the list (i.e., only int type values should remain)... can you make it using a single line of code? now it's the time to… text/html 2024-03-15T13:30:12+03:00 http://ocw.cs.pub.ro/courses/ii/labs/s2/01/tasks/04?rev=1710502212&do=diff 04. [25p] Word Map First, take a couple (3-4) of paragraphs from here and store them inside a .txt file. * Open the file and read its contents into string; * Build a dict with each word from this text (lower cased as key), counting their frequency (as its value); * Use it to print out the most frequent 5 words in this text (together with their value!), e.g.: text/html 2024-03-15T13:30:52+03:00 http://ocw.cs.pub.ro/courses/ii/labs/s2/01/tasks/05?rev=1710502252&do=diff 05. [10p] Bonus: Lyrics retrieval What else can you do easily using Python... ? Let's try this one: * fetch the lyrics of your favorite song from this site. requests pip * Extract just the lyrics part from the HTML code and print it to the console! (also, please get rid of those <br> line break tags, replace them with newlines instead).