Filtering a Package

quilt3 provides a handful of functions for operating on the contents of a package in an entry-by-entry manner. These are helpful for performing more complicated parsing operations on the package:

import quilt3

# create a package
p = (quilt3.Package()
        .set_dir("dict", "/usr/share/dict/")
        .set("words", "/usr/share/dict/words"))

# element-wise transform entries, outputting a list
# here "lk" is shorthand for "logical_key"
# and "entry" is the package entry lk, entry: entry)

# filter out entries not meeting certain criteria
p.filter(lambda lk, entry: 'cool' not in lk)

Notice that these functions operate over (logical_key, entry) tuples. Each logical_key is a string. Each entry is PackageEntry object, as would be returned if you slice to a leaf node of the package (e.g. p['bar']).

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