def readFile(name, separator=','):
    csvList = []
    try:
        with open(name, 'r') as csvFile:
            for line in csvFile.readlines():
                if line.isspace(): continue
                csvList.append(line.strip().split(separator))
                assert len(csvList[0]) == len(csvList[-1]), "Unproper number of column in a row"
        return csvList

    except FileNotFoundError:
        print("File has not found. Please provide correct path")


def saveFile(file, fileName, separator=','):
    try:
        with open(fileName+'_writed.csv','w+') as csvFile:
            for line in file:
                csvFile.writelines("{}\n".format(separator.join(line)))
    except IndexError:
        print('Probably your list is empty.')


def main():
    path = 'cities.csv'
    readedFile = readFile(path)
    saveFile(readedFile,path)

if __name__ == '__main__':
    main()