import sys
import pandas as pd

def pci_wld_eci(eci_file_path, pci_file_path, ymp, ymw, year):
    
    pcis = pd.read_csv(pci_file_path, sep="\t", compression="bz2", converters={"hs_id": str})
    pcis["year"] = int(year)
    pcis["month"] = "00"
    pcis = pcis.set_index(["year", "month", "hs_id"])
   
    ecis = pd.read_csv(eci_file_path, sep="\t", compression="bz2")
    ecis["year"] = int(year)
    ecis["month"] = "00"
    ecis = ecis.set_index(["year", "month", "wld_id"])
    
    ymp["pci"] = pcis["pci"]
    ymw["eci"] = ecis["eci"]
    
    return [ymp, ymw]
    
pandas.read_csv