old_contents: import sys, os
  import pandas as pd
  import numpy as np
  
  ps_calcs_lib_path = os.path.abspath(os.path.join(file_path, "../../", "lib/ps_calcs"))
  sys.path.insert(0, ps_calcs_lib_path)
  import ps_calcs
  
  def calc_rca(ybuc, year):
  
      ybc = ybuc.groupby(level=["year", "bra_id", "course_hedu_id"]).sum()
      ybc = ybc[["enrolled"]]
      ybc = ybc.reset_index()
      ybc = ybc.drop("year", axis=1)
  
      rcas = ybc.pivot(index="bra_id", columns="course_hedu_id", values="enrolled")
      rcas = ps_calcs.rca(rcas)
      rcas = pd.DataFrame(rcas.stack(), columns=["enrolled_rca"])
  
      rcas = rcas.replace(0, np.nan)
      rcas = rcas.dropna(how="all")
  
      rcas["year"] = int(year)
      rcas = rcas.set_index("year", append=True)
      rcas = rcas.swaplevel("year", "course_hedu_id")
      rcas = rcas.swaplevel("year", "bra_id")
  
      return rcas
new_contents: import sys, os
  import pandas as pd
  import numpy as np
  
  file_path = os.path.dirname(os.path.realpath(__file__))
  ps_calcs_lib_path = os.path.abspath(os.path.join(file_path, "../../", "lib/ps_calcs"))
  sys.path.insert(0, ps_calcs_lib_path)
  import ps_calcs
  
  def calc_rca(ybuc, year):
  
      ybc = ybuc.groupby(level=["year", "bra_id", "course_hedu_id"]).sum()
      ybc = ybc[["enrolled"]]
      ybc = ybc.reset_index()
      ybc = ybc.drop("year", axis=1)
  
      rcas = ybc.pivot(index="bra_id", columns="course_hedu_id", values="enrolled")
      rcas = ps_calcs.rca(rcas)
      rcas = pd.DataFrame(rcas.stack(), columns=["enrolled_rca"])
  
      rcas = rcas.replace(0, np.nan)
      rcas = rcas.dropna(how="all")
  
      rcas["year"] = int(year)
      rcas = rcas.set_index("year", append=True)
      rcas = rcas.swaplevel("year", "course_hedu_id")
      rcas = rcas.swaplevel("year", "bra_id")
  
      return rcas
subject: Fix ps_calcs hedu dependency