mmmh... I bet on ordering problems.

Read the message just below and my answer.

markdowns, plz, so that the code is readable...

and you still didn't paste the assertion message you get on cw.

how could we tell since you don't give any actionnable information, neither about the way your code is failing (error? assertions messages?) nor about what your code is...? :o (note: do never post code without a spoiler flag)

So, being limited to wild guesses, I'd bet on global variables?

if name=='main':
assert(format_duration(1)=="1 second")
assert(format_duration(62)=="1 minute and 2 seconds")
assert(format_duration(120)=="2 minutes")
assert(format_duration(3600)=="1 hour")
assert(format_duration(3662)=="1 hour, 1 minute and 2 seconds")

These tests in my IDE pass without errors, but only the first passes on the site. What am I doing wrong?

https://docs.python.org/2/library/collections.html#collections.OrderedDict

?

I work locally on Python 3.6+ and solved this correctly. I did not notice until submission that it will only compile with 2.7, which is a problem because my logic/solution (down to the output) is based on the inherent nature of dictionaries in 3.6+ to maintain order of declaration. Any way you can extend the compiler capabilities to handle this? By the way, I am a new user (1 day) so not sure how or how often these are maintained. Thank you!

Thanks for your help! Indeed I had a spacing error when copying over from local machine. Thanks

Fixed description

Reloading shouldn't help because this is the code runner saying no output (stdout/stderr) was produced by the submitted code.
Most likely the solution crashed.

Someone might be able to help if you post your solution here, marking as a spoiler.

That's a CW issue, not a Kata issue. Try reloading the page.

Response received but no data was written to STDOUT or STDERR.