Convert state plane PA South coordinates to lat/longs

convert.py

import pyproj

def convert(x, y):
  state_plane = pyproj.Proj(init='epsg:2272', preserve_units=True)
  wgs = pyproj.Proj(proj='latlong', datum='WGS84', ellps='WGS84')
  lng, lat = pyproj.transform(self.state_plane, self.wgs, x, y)
  return lat, lng

This worked for me after I changed line 6 to:

lat, lng = pyproj.transform(state_plane, wgs, x, y)