PythonQuestion

import sys

listDic = {}
data = ["Bird eats Prawn","Bird eats Mussels","Bird eats Crab","Bird eats Limpets","Bird eats Whelk","Crab eats Mussels","Crab eats Limpets",
        "Fish eats Prawn","Limpets eats Seaweed","Lobster eats Crab",
        "Lobster eats Mussels","Lobster eats Limpets","Lobster eats Whelk","Mussels eats Phytoplankton",
        "Mussels eats Zooplankton","Prawn eats Zooplankton","Whelk eats Limpets","Whelk eats Mussels","Zooplankton eats Phytoplankton"]

def readFile():
        v = []
        if (len(sys.argv) == 2):
                fileName = sys.argv[1]
        else:
                fileName = input("Enter the file name: ")
        inf = open(fileName, "r")
        line = inf.readline().rstrip()
        while (line != ""):
                v.append(line)
                line = inf.readline().rstrip()
        return v
def part1(data):
        for i in range (0,len(data)):
                splitLine = data[i].split("eats")
                if splitLine[0] in listDic:
                        listDic[splitLine[0]].append(splitLine[1])
                else:
                        l = [splitLine[1]]
                        listDic[splitLine[0]] = (l)
        for key in listDic.keys() :
                l = listDic.get(key)
                print (key,"eats",end=":")
                for z in range (0,len(l)):
                        if ((len(l) -z) ==1):
                                print (l[z],end="")
                        else:
                                print (l[z],end=",")

                print()


def part2():
        listPredators = listDic.keys()
        for i in range (0,len(listPredators)):
                for key in (listDic.keys()):
                        listPrey = listDic.get(key)
                        #print("Predator: ",list(listPredators)[i])
                        #print("Prey: ",listPrey)
                        #print(list(listPredators))
                        for m in range (0,len(listPrey)):
                                z =(list(listPrey)[m].split(" "))
                                print("Predators ", list(listPredators)[i])
                                print(z[1])
                                if (list(listPredators)[i] == z[1]):
                                        print("Hello")



def main():
        part1(data)
        part2()

main()