Repeated string concatenation is quadratic in PyPy (and CPython)
Briefly

This is a super brief blog post responding to an issue that we got on the PyPy issue tracker.I am moving my response to the blog (with permission of the submitter) to have a post to point to, since it's a problem that comes up with some regularity.It's also documented on our page of differences between PyPy and CPython but I thought an additional blog post might be good.
Read at PyPy
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