The Python Challenge is a nifty site that presents you with a series of puzzles that it asks you to solve using python; getting each answer allows you to move on to the next puzzle.

Python is a cool language and it's a good tool for this job¹ However, I'm learning clojure right now, so I thought it would be fun to try and solve a few of them in clojure. Here's my answers for challenges 0 thru 4 (warning: if you want to do these puzzles yourself, reading further now might ruin the fun)

Challenge #0 (the "Warmup")

Asks you to solve 2 to the 38th power:

(clojure.contrib.math/expt 2 38)

i.e. just use the exponent function in clojure contrib.

Challenge #1

This one throws some scrambled text at you and a clue on what the key is (ROT 2):

(defn translate [text]
  (let [lookup (vec (map char (range 97 123)))]
    (letfn [(letter? [c] (and (>= (int c) 97) (<= (int c) 122)))
            (shift-2 [c] (mod (+ 2 (- (int c) 97)) 26))]
      (apply str (map #(if (letter? %) (get lookup (shift-2 %)) %) text)))))

Create a lookup table of the chars, a predicate to test if a char is a letter. & a function to get the index of 2nd to next letter (the index loops, essentially making lookup as a ring buffer), then map across the given text, shifting by 2 if its a letter or just returning the char if its not.

Challenge #2

This one throws a big hunk of random data at you and suggests you pick out the 'rare' characters:

(defn filter-file [path]
  (let [fs (line-seq (clojure.contrib.io/reader path))
        lookup (set (map char (range 97 123)))]
    (apply str (mapcat #(filter lookup %) fs))))

A quick visual scan of the text led me to a strong hunch the "rare"² characters were lowercase alpha, so:

Re-use our lookup table from the last challenge; this time make it a set, then use the set to filter each line of the file denoted by 'path' (I first saved the text to a file to make it easier to work with); use mapcat to flatten the lines out (this has the effect of stripping empty lines altogether); apply str to the resulting sequence to get the answer.

Challenge #3

This one's a big hunk of text too, so a quick refactoring of our last solution results in a more abstract (and higher-order) function that takes a filter function as an additional parameter:

(defn filter-file [filter-fn path]
    (apply str (mapcat filter-fn (line-seq (io/reader path)))))

the filter from challenge #2 thus becomes an argument; partial works nicely here:

(filter-file (partial filter (set (map char (range 97 123)))) "path/to/file")

Now we can make a new filter for challenge #3. This one will need to find character patterns that look like this: ABCxDEF. We'll need grab x. This one just screamed regex at me, so here's a filter that gives us the answer:

#(second (re-find #"[^A-Z][A-Z]{3}([a-z])[A-Z]{3}[^A-Z]" %)))

An anonymous function³ that uses re-find to match: "not-cap followed by 3 CAPS followed by not-cap followed by 3 CAPS followed by not-cap"; the second element of the resulting vector (because we use parens to create a group) produces x; mapcat et al do the rest.

Two big assumptions/limitations here: assumes each target is on its own line, and that the target pattern wasn't on the beginning or end of the line (which was good enough to get the answer).

Challenge #4

This challenge requires one to follow a url call chain, passing a different number as the argument to a 'nothing' parameter each time. The resulting page text provides the next number to follow (and/or some noise to keep you on your toes) until eventually we get the answer.

This one gets kinda ugly.

This is the kind of problem scripting languages are made for (e.g. perl, python & ruby coders would all make short work of this problem). Still, it's possible to write procedural code in clojure, and it's still reasonably straightforward.

One decision I had to make is how to GET the url's - my weapon of choice for this sort of thing is clj-http:

(require '[clj-http.client :as client])
(require '[clojure.contrib.string :as string]

(defn follow-chain [base-url number]
  (let [result (:body (client/get (str base-url number)))
        idx (.indexOf result "and the next")]
    (cond
      (re-find #"^Yes" result) (do
                                 (println result)
                                 (follow-chain base-url (/ (Integer/parseInt number) 2)))
      (= -1 idx)               result
      :else                    (let [result-vec (string/split (subs result idx) #" ")
                                     next-number (last result-vec)]
                                 (println result)
                                 (recur base-url next-number)))))

Take the url as a base & the first number to follow; use client-http/get to grab the page; extract the body of the page; get the index of the phrase "and the next" using the java "indexOf" method - we'll use the index later to parse out the end of the text and get the next number...

...unless of course, we get text that tells us something else (like a message saying "Yes" and then instructing us to divide the last number by two and continue on as before) so...

...we set up a switch using the cond macro: If the result starts with "Yes" make a recursive call dividing the last number by two; if indexOf otherwise came up empty, that's our answer, so return it; else pick the next number out of the result by splitting the end of the string into a vector (using clojure.contrib.string/split) and recur (tail recursively call the function again).

The println's could be removed, although they were essential when figuring out what the code needed to do.

Conclusion

This was a fun exercise; clojure's holding up pretty well so far, though clojure would not be my weapon of choice for that last one; if I choose to do the next five, I'll post them in a future article.

Footnotes

list of useful methods of itertools module.

permutationscombinationscombinations_with_replacementzip_longestcountrepeatcycleaccumulateproductgroupbyteeisslicechainchain.from_iterablefilterfalsedropwhile

realpython.com

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Hi, my name is Gilad Gressel and I’d like to tell you about my new course: Deep Learning with Python. Deep learning is an old technology that has recently been sweeping through the field of machine learning and artificial intelligence. Deep learning powers many of the cutting edge technologies that appear to be “magic” in [...]

אני מחפש עבור חברה מבוססת, מפתח חזק עם נגיעה בארכיטקטורה ודיזיין מישהו שיודע לקחת אחראיות מלאה על קוד ולרוץ משם. נחוץ ידע בפיתוח Python. יתרון להיכרות עם AWS/GCP, microservices.ניסיון מוצרי ואפליקטיבי.מדובר במשרה מלאה, במודל היברידי של יומיים במשרד.** המשרה פונה לעצמאים או שכירים בלבד**** חברות תכנה בבקשה לא לפנות **

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Getting Started with Python Integration to SAS Viya for Predictive Modeling - Comparing Logistic Regression and Decision Tree was published on SAS Users.

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A new Python library has been written to facilitate an interface between Python and AWR software using a command structure that adheres more closely to Python coding conventions. This library is labeled "pyawr-utils" and it is installed using the standard Python pip command. Comprehensive documentation for installing and using pyawr-utils is available.(read more)

As a verification engineer, you’re surely looking for ways to automate the debugging process. Have you developed your own scripts to ease specific debugging steps that tools don’t offer? Working with scripts locally and manually is challenging—so is reusing and organizing them. What if there was a way to create your own app with the required functionality and register it with the tool? The answer to that question is “Yes!” The Verisium Debug Python App Store lets you instantly add additional features and capabilities to your Verisium Debug Application using Python Apps that interact with Verisium Debug via the Python API. Join me, Principal Education Application Engineer Bhairava Prasad, for this Training Webinar and discover the Verisium Debug Python App Store. The app store allows you to search for existing apps, learn about them, install or uninstall them, and even customize existing apps. Date and Time Wednesday, November 20, 2024 07:00 PST San Jose / 10:00 EST New York / 15:00 GMT London / 16:00 CET Munich / 17:00 IST Jerusalem / 20:30 IST Bangalore / 23:00 CST Beijing REGISTER To register for this webinar, sign in with your Cadence Support account (email ID and password) to log in to the Learning and Support System*. Then select Enroll to register for the session. Once registered, you’ll receive a confirmation email containing all login details. A quick reminder: If you haven’t received a registration confirmation within one hour of registering, please check your spam folder and ensure your pop-up blockers are off and cookies are enabled. For issues with registration or other inquiries, reach out to eur_training_webinars@cadence.com . Like this topic? Take this opportunity and register for the free online course related to this webinar topic: Verisium Debug Training To view our complete training offerings, visit the Cadence Training website Want to share this and other great Cadence learning opportunities with someone else? Tell them to subscribe . Hungry for Training? Choose the Cadence Training Menu that’s right for you. Related Courses Xcelium Simulator Training Course | Cadence Related Blogs Unveiling the Capabilities of Verisium Manager for Optimized Operations - Verification - Cadence Blogs - Cadence Community Verisium SimAI: SoC Verification with Unprecedented Coverage Maximization - Corporate News - Cadence Blogs - Cadence Community Verisium SimAI: Maximizing Coverage, Minimizing Bugs, Unlocking Peak Throughput - Verification - Cadence Blogs - Cadence Community Related Training Bytes Introducing Verisium Debug (Video) (cadence.com) Introduction to UVM Debug of Verisium Debug (Video) (cadence.com) Verisium Debug Customized Apps with Python API Please see course learning maps a visual representation of courses and course relationships. Regional course catalogs may be viewed here . *If you don’t have a Cadence Support account, go to Cadence User Registration and complete the requested information. Or visit Registration Help .

Hello Team,
I am currently following this AWR script posted on them, to run a python script directly from inside AWR using VBA script.

Launching Python from AWRDE VBA Script - AWR Scripts - AWR Knowledgebase

Following all the basic steps with no changes to the code. I have Vscode and python-3.12.2 installed in my system. 

This is the error I am getting while running this code. 

Thank you for your help 

Best Regards

SID

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