Don't list pygments styles on import #10859
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Listing pygments styles forces pygments to load plugins, which slows startup and may cause unexpected errors from other packages. Closes jupyter/notebook#2926
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With this change, I see a reduction in cold-start time from ~11 seconds to ~6 seconds (this is on a spinning metal hard drive), and a reduction in warm start from ~1.1s to ~0.9s. |
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I'll merge this tomorrow unless someone says otherwise. |
takluyver
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Backport PR #10859 on branch 5.x
vbraun
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Among other improvements in these bugfix releases, the [[https://ipython.readthedocs.io/en/5.x/whatsnew/version5.html|IPython 5.x release notes]] mention that - IPython should start faster, as it no longer looks for all available pygments styles on startup ([[ipython/ipython#10859 #10859]]). - Update inspecting function/methods for future-proofing (a patch meant for Sage). '''Tarball''': - https://files.pythonhosted.org/packages/41/a6/2d25314b1f9375639d8f8e0f 8052e8cec5df511d3449f22c4f1c2d8cb3c6/ipython-5.8.0.tar.gz URL: https://trac.sagemath.org/25083 Reported by: slelievre Ticket author(s): Jeroen Demeyer Reviewer(s): Travis Scrimshaw
vbraun
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Aug 10, 2018
Among other improvements in these bugfix releases, the [[https://ipython.readthedocs.io/en/5.x/whatsnew/version5.html|IPython 5.x release notes]] mention that - IPython should start faster, as it no longer looks for all available pygments styles on startup ([[ipython/ipython#10859 #10859]]). - Update inspecting function/methods for future-proofing (a patch meant for Sage). '''Tarball''': - https://files.pythonhosted.org/packages/41/a6/2d25314b1f9375639d8f8e0f 8052e8cec5df511d3449f22c4f1c2d8cb3c6/ipython-5.8.0.tar.gz URL: https://trac.sagemath.org/25083 Reported by: slelievre Ticket author(s): Jeroen Demeyer Reviewer(s): Travis Scrimshaw
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Listing the styles forces pygments to load plugins, which slows startup and may cause unexpected errors from other packages. We shouldn't be calling this on import.
The list of available styles will also depend on what packages are installed, so building our config docs with one list may be misleading. I've made the help string point to
pygmentize -L stylesto see available styles on your system.Closes jupyter/notebook#2926