NZOI / nztrain / 926

38%

push

travis-ci

Add PyPy for Python 3.6 to "Other" language options (#104)

PyPy is an alternative implementation of Python that is expected to be
faster than CPython (the standard implementation) when judging Python
submissions.

There are no plans to remove CPython in the near future, because PyPy
is often a few versions behind CPython and there are small
compatibility issues. The biggest one is probably that CPython has an
optimisation that can make repeated string concatenation run in O(n)
time, while in PyPy it is always O(n^2).[1] But note that PEP 8
recommends not to rely on this optimisation.[2]

[1] https://pypy.readthedocs.io/en/latest/cpython_differences.html#performance-differences
[2] https://www.python.org/dev/peps/pep-0008/#programming-recommendations

1 of 1 new or added line in 1 file covered. (100.0%)

2325 of 7016 relevant lines covered (33.14%)

4.8 hits per line