Check List Password Duplication

check-list-pass.py

def checkIfDuplicates(listOfElems):
    ''' Check if given list contains any duplicates '''
    setOfElems = set()
    for elem in listOfElems:
        if elem in setOfElems:
            return True
        else:
            setOfElems.add(elem)         
    return False

lines = []
with open("pass-list.txt", "r") as f:
    for line in f:
        line = line.strip()
        lines.append(line)
        
print(checkIfDuplicates(lines))