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Histogramming for analysis powered by boost-histogram

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## How do you want to improve the docs In Issue #279 @nsmith- gave a really nice coverage example. It would be nice to be able to show something similar...

documentation

Besides #265, we also need to update docs for some latest features. #282 has added some, we also need: - [ ] tests and docs `.from_columns` and `plot_pie` #140. -...

documentation
good first issue

A possible design for stacked histograms is the following: A HistStack holds multiple histograms; axes are required to match. Calling `.plot(...)` forwards to mplhep, just like Hist.plot, but with the...

enhancement

We should include the contents and use the structure of the boost-histogram docs, just slightly modified to suit Hist usage. Most user's won't want to read both sets of documentation....

documentation
good first issue

In coffea, there is support for converting coffea histograms to root histograms by uproot3 for 1-dimensional histograms only. I'm using in my analysis lots of 2-dimensional histograms, so i wrote...

enhancement

### Discussed in https://github.com/scikit-hep/hist/discussions/252 Originally posted by **b-fontana** July 6, 2021 As discussed in the Slack channel of [PyHEP21](https://indico.cern.ch/event/1019958/) as a result of [this tutorial](https://indico.cern.ch/event/1019958/contributions/4420290/), it would be very nice...

good first issue

It would be convenient to have a config for repr akin to `np.set_printoptions` I've just found myself with a dict of hist objects (filled in coffea) and printing that with...

enhancement
good first issue

`.fill()` should intelligently take awkward arrays. It would be very convenient to do things like ``` blist = ['Jet_pt', 'Jet_eta'] h = Hist(...) for chunk in f['Events'].iterate(blist, step_size=1000): h.fill(chunk) ```...

enhancement