Python string comparator from csv input

StringPercentageComparison

import csv

words = []

def charComp(a, b):
    if a == b:
        return ("100%")
    tempW = ''
    for count in range(len(a)):
        if count >= len(a) or count >= len(b):
            v1 = round(len(tempW) / len(a) * 100)
            v2 = round(len(tempW) / len(b) * 100)
            return (str(v1) + "%", str(v2) + "%")

        if a[count] != b[count]:
            v1 = round(len(tempW) / len(a) * 100)
            v2 = round(len(tempW) / len(b) * 100)
            return (str(v1) + "%", str(v2) + "%")
        else:
            tempW = tempW + a[count]

def readNamesFile():
    with open("./Test function.csv") as namescsv:
        csv_reader = csv.reader(namescsv, delimiter=',')

        for row in csv_reader:
            a = ' '.join(row[0].split())
            b = ' '.join(row[1].split())

            if len(a) >= len(b):
                words.append(charComp(a,b))
            else:
                x = list(charComp(b,a))
                x.reverse()
                x = tuple(x)
                words.append(x)

readNamesFile()

for line in words:
    print(line)