padded String

(env) eDiscoverysiMac:mac_apt ediscovery$ python mac_apt.py -h
Traceback (most recent call last):
  File "mac_apt.py", line 23, in <module>
    import plugins.helpers.macinfo as macinfo
  File "/Users/ediscovery/Python/MacApt/mac_apt/plugins/helpers/macinfo.py", line 26, in <module>
    from plugins.helpers.hfs_alt import HFSVolume
  File "/Users/ediscovery/Python/MacApt/mac_apt/plugins/helpers/hfs_alt.py", line 29, in <module>
    from plugins.helpers.btree import AttributesTree, CatalogTree, ExtentsOverflowTree
  File "/Users/ediscovery/Python/MacApt/mac_apt/plugins/helpers/btree.py", line 18, in <module>
    from plugins.helpers.structs import *
  File "/Users/ediscovery/Python/MacApt/mac_apt/plugins/helpers/structs.py", line 185, in <module>
    "unicode" / PaddedString(lambda ctx: ctx["length"] * 2, encoding="utf-16-be") # "unicode",
NameError: name 'PaddedString' is not defined
(env) eDiscoverysiMac:mac_apt ediscovery$