Thank you araraloren! Oh, I found the error. A low-level error: return quicksort(forehalf)+list(numbers[0])+quicksort(endhalf), list(numbers[0]) is illegal, it should be: return quicksort(forehalf)+[numbers[0]]+ quicksort(endhalf)
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Thank you araraloren!
Oh, I found the error. A low-level error: return quicksort(forehalf)+list(numbers[0])+quicksort(endhalf), list(numbers[0]) is illegal, it should be: return quicksort(forehalf)+[numbers[0]]+ quicksort(endhalf)