def __init__(self, archivePathname):
        """Create a ZipArchive, treating the archive at archivePathname as a zip file.

        @param archivePathname: a str, naming a path in the filesystem.
        """
        self.zipfile = ChunkingZipFile(archivePathname)
        self.path = archivePathname
        self.pathInArchive = ''
        # zipfile is already wasting O(N) memory on cached ZipInfo instances,
        # so there's no sense in trying to do this lazily or intelligently
        self.childmap = {}      # map parent: list of children

        for name in self.zipfile.namelist():
            name = name.split(ZIP_PATH_SEP)
            for x in range(len(name)):
                child = name[-x]
                parent = ZIP_PATH_SEP.join(name[:-x])
                if parent not in self.childmap:
                    self.childmap[parent] = {}
                self.childmap[parent][child] = 1
            parent = ''
dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/python/zippath.py/ZipArchive.__init__/original