Ronan Lamy

``` I've more or less abandoned the idea of using the design from #c2. Having two classes (exp and _exp) for the same concept seems too confusing and cumbersome. I'd...

``` **Blocking:** 5033 ``` Referenced issues: #5033 Original comment: http://code.google.com/p/sympy/issues/detail?id=1688#c9 Original author: https://code.google.com/u/101272611947379421629/

``` Note that I have a commit ( https://github.com/rlamy/sympy/commit/3dd0f38c685f2837cb336878e14991af8346965a ) that splits the tests between generally useful behaviour and secondquant-specific stuff in PR #1162 ( https://github.com/sympy/sympy/pull/1162 ). If anyone wants...

@martindurant I couldn't reproduce the issue. I also don't really see how the `_iterdir()` change could affect this.

Well, I'm still using this as a local viewer from time to time. I've never tried vmprof-firefox-converter though.

> Do we have idea how we are going to do indexing? The general idea is that it'll use `File` objects and behave like existing generators, but the details are...

I think that all the segfaults are caused by CPython [now using](https://github.com/python/cpython/pull/116115) bit 2 of `tp_flags`, which clashes with `HPy_TPFLAGS_INTERNAL_IS_HPY_TYPE`. Unfortunately, there are no free bits left, so we can't...

@mattip HPy-for-PyPy is implemented in the pypy repo. The tests in this repo aren't meant to run on pypy. The tests you want to run are in `/extra_tests/hpy_tests`.

A couple questions: * what should be the role of `DatasetQuery` * what's its expected relationship with `DataChain` (base class, attribute, something else...)?

Since we're now getting rid of most of the code that expected `DatasetQuery` to be user-facing, it might be time to tackle this. A simple first step should be to...