__init__.py 文件源码

def __init__(self, zonefile_stream=None):
        if zonefile_stream is not None:
            with tar_open(fileobj=zonefile_stream, mode='r') as tf:
                # dict comprehension does not work on python2.6
                # TODO: get back to the nicer syntax when we ditch python2.6
                # self.zones = {zf.name: tzfile(tf.extractfile(zf),
                #               filename = zf.name)
                #              for zf in tf.getmembers() if zf.isfile()}
                self.zones = dict((zf.name, tzfile(tf.extractfile(zf),
                                                   filename=zf.name))
                                  for zf in tf.getmembers()
                                  if zf.isfile() and zf.name != METADATA_FN)
                # deal with links: They'll point to their parent object. Less
                # waste of memory
                # links = {zl.name: self.zones[zl.linkname]
                #        for zl in tf.getmembers() if zl.islnk() or zl.issym()}
                links = dict((zl.name, self.zones[zl.linkname])
                             for zl in tf.getmembers() if
                             zl.islnk() or zl.issym())
                self.zones.update(links)
                try:
                    metadata_json = tf.extractfile(tf.getmember(METADATA_FN))
                    metadata_str = metadata_json.read().decode('UTF-8')
                    self.metadata = json.loads(metadata_str)
                except KeyError:
                    # no metadata in tar file
                    self.metadata = None
        else:
            self.zones = dict()
            self.metadata = None


# The current API has gettz as a module function, although in fact it taps into
# a stateful class. So as a workaround for now, without changing the API, we
# will create a new "global" class instance the first time a user requests a
# timezone. Ugly, but adheres to the api.
#
# TODO: deprecate this.