I've been missing the computer challenges on brilliant, so I went looking for some other resources. I would highly recommend Codecademy, especially for those who only know a little programming or want to learn some new languages. If you're looking specifically for Python challenges, I've been enjoying Python Challenge.

Do any of you have recommendations of other sites to sharpen or expand programming skills?

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TopNewestProject Euler has been mentioned here a few times in the past; another website that I think contains some nontrivial challenges is CodeEval. I myself am also very curious about your question, so I hope others will contribute more links.

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Project Euler is very Powerful! Definitely start there, if you want to practice some number theory while you are at it I have seen the first 25 problems (out of like 600) solved by hand. Plus after you find a solution you can look at others more concise solutions.

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I tried CodeEval, but it says that my submission fails. When I try the test cases though, it works perfectly. It doesn't give me any feedback on what went wrong, though, which is a shame.

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There is good feedback actually, once you find it. It always says "submitted successfully" unless your file has a file extension it doesn't know about. Click the link named "score". There you see whether it failed or not. If it failed, click on the revision number in the first column, and you see what the output from the program was, including error messages from the compiling/parsing/run time system.

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`print()`

is the right way to output when using Python?Log in to reply

Weekly algorithm contests in C++/Java/C#/Python, and ability to practice on previous challenges with lots of very good tutorials:

Topcoder

Online judges with lots of problems:

SPOJ

POJ

And, of course, USACO that holds monthly contests starting November to select the 4 high school students that represent USA in the International Olympiad of Informatics, the next Summer. It also has a system with tutorials and programming challenges that you have to overcome one level at a time to learn and face more difficult challenges.

And I was almost forgetting:

There are two multi-round yearly algorithm contests that are for everyone to participate hosted by Google and Facebook:

Google Code Jam

Facebook Hacker Cup

Google Code Jam usually starts around April and Facebook Hacker Cup in January. Additionally, you can see all previous problems for GCJ and test your solutions.

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I will recommend following:

Highly recommended

Codechef

IBM

Techgig

Project Euler

Recommended

Codeeval

Greplin

UVA

Codeforces

Codefu

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USACO -> the USAMO of c.s.

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I have some recommended for you:

URI Online Judge.

List, on the Wikipedia :)

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jan;s LightOJ is also very good

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Programming Praxis is a good one.

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Love that site! A great place for people who really love math, and Computer Science!

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