Search books by ISBN books in a text file

# Search books by ISBN books in a text file
# Attention! file books.txt should lie next to the script .py
# created by impressive_i

#Метод поиска книги
def searchByISBN( isbn ):
    isbn += " "
    count = 0
    fileBooks.seek(0)
    for line in fileBooks:
        count += 1
        line = line.rstrip()
        if isbn in line:
            startIndex = line.find(' ') + 1
            return "Книга #" + str(count) + " " + line[startIndex:]
    return "Данной книги нет в списке"

# Путь до файла с книгами
pathbooks = "Books.txt"

try:
    fileBooks = open(pathbooks, "r")
    try:
        symbolsForOutput = ("exit", 0, "0", False, "out")
        while(True):
            isbn = input("Put ISBN or \"exit\": ")
            if isbn in symbolsForOutput:
                break
            currentbook = searchByISBN( isbn )
            print( currentbook )

    except Exception as e:
        print("Error: ошибка чтения файла: ", e)
    finally:
        fileBooks.close()

except Exception as ex:
    print("Error: ошибка при открытии файла: ", ex)