如何在python中计算空行数

我正在读一个包含空行和单词的文件,例如“CAR”和“V3HICL3”。我只想把合法的单词写入另一个文件。为此,我想删除空行和有错误的单词(此处包含数字)。我还想数一数有多少行被阅读、删除和接受。我在捕捉空行时遇到问题。在我的列表中,我有:car,v3hicl3,“空”。我数不清空行。尝试了isspace和line==“\n”。似乎不管用。我该如何计算文档的最后一行空行?

import sys
def read():
    file_name = input("Name of the file to be read: ")
    try:
        file = open(file_name, 'r')
        lst = []
        line_num = 0
        accept_line = 0
        reject_line = 0
        empty_line = 0
        for line in file:
            line = line.strip() 
            if (len(line.strip()) == 0):
                line_num += 1
            if (line == "\n"):
                line_num += 1
            if (len(line) != 0):
                line_num += 1
            if (line.isalpha()):
                accept_line += 1
                lst.append(line)
            else:
                reject_line += 1
    print("Read", line_num, "lines")
    print("Rejected", reject_lines, "lines")
    except FileNotFoundError:
        print("open", file_name, "failure.")
        sys.exit(0)
    file.close()
    return lst, accept_line

感谢您的任何意见。