Question

我有一个太大的txt文件，有几条相似的行，如下所示：

word1 word2 word3 word4 -553.75

我对位置[4]“价值”感兴趣，最后一行是-553.75

我的档案文字：

.
.
word1 word2 word3 word4 -553.20
.
.
.
word1 word2 word3 word4 -553.25
.
.
.
word1 word2 word3 word4 -553.75
.
.
.

我的剧本：

def main():
    oTE_list = []
    oTE = []

    with open("file.txt","r") as f:
    text = f.readlines()
    for line in text:
        if line[0] == 'word1' and line[1] == 'word2' and line[2] == 'word3' and line[3] == 'word4':
      oTE_list.append(line[4])



    # Change Lists To Number Format
    for idx, item in enumerate(oTE_list):
        if idx == len(oTE_list) - 1:
            print(item)


if __name__ == '__main__':
    main()

但我不知道为什么它不适用于我！

提前谢谢。

Answer 1

该行是字符串而不是单词列表，要将其转换为单词使用列表strip和\n，然后才能删除def main(): oTE_list = [] oTE = [] with open("file.txt","r") as f: text = f.readlines() for line in text: line = line.strip().split() if line[0] == 'FINAL' and line[1] == 'SINGLE' and line[2] == 'POINT' and line[3] == 'ENERGY': oTE_list.append(line[4]) # Change Lists To Number Format for idx, item in enumerate(oTE_list): if idx == len(oTE_list) - 1: print(item) if __name__ == '__main__': main()

        InputStream inputStream = assetManager.open("cert.cer");
        CertificateFactory cf = CertificateFactory.getInstance("X.509", "BC");
        X509Certificate certificate = (X509Certificate) cf.generateCertificate(inputStream);

Answer 2

方式不使用re并从文件末尾读取

import re
with open("file1.txt","r") as f:
    for line in reversed(f.readlines()):
        if re.search('word1.*word2.*word3.*word4',line):
            print(line.split(' ')[-1])
            break

如何使用python读取最后一行中的特定位置

2 个答案: