utils.traitlets
utils.warn
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A script/util to upgrade all files in a directory
This is rather conservative in its approach, only copying/overwriting new and unedited files.
To be used by “upgrade” feature.
Copy over all files in srcdir to tgtdir w/ native line endings
Creates .upgrade_report in tgtdir that stores md5sums of all files to notice changed files b/w upgrades.