Question

Please show how to do the following problems in Python.

def removeDups(L1, L2, L3):
'''The inputs L1, L2, L3 are lists,
return a list that contains all the items in L1 and L3 but not in L2
'''
#this method requires you to use the remove() function for a list
  

def removeDups2(L1, L2, L3):
'''The inputs L1, L2, L3 are lists,
return a list that contains all the items in L1 and L3 but not in L2
'''
#this method requires you to use the append() function for a list

Answer 1

def removeDups(L1,L2,L3):
    L=L1+L2+L3
    length=len(L)
    i=0
    while i<length:
        if L[i] in L2:
            L.remove(L[i])
            length=length-1
        else:
            i=i+1
    return L


def removeDups2(L1,L2,L3):
    Lold=L1+L2+L3
    Lnew=[]
    for i in Lold:
        if i not in L2:
            Lnew.append(i)
    return Lnew