Output raw call stack data about py-spy HOT 5 CLOSED

This shouldn't be too hard to do.

I'm also thinking about adding a python api (using approach I wrote about here: http://benfrederickson.com/writing-python-extensions-in-rust-using-pyo3/) which would let you script operations like this.

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I've added this in v0.2.0

@nziebart there is also now a ``--idle``` flag to show idle frames

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A python api would be awesome!

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It would also be nice to be able to get "idle" stack traces (i.e., not omit them). Sometimes it's useful to know where idle time is being spent (e.g., I might want to know what % of time I spend waiting on a particular db query)

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Any progress on this?

I have a totally different use case than simply generating flame graphs or viewing the profiling information in real-time. I would love to be able to get the raw data used to generate the flame graph, for example.

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