Python 读取日志文件并获取包含特定单词的行

Question

我有日志文件(以 YYMMDD 格式命名)，我想创建一个脚本，只从文件中获取重要信息(比如包含“O:NVS:VOICE”的行)。我以前从未使用过 Python，所以请帮忙!

Answer 1

这应该能让你很好地开始:

infile = r"D:\Documents and Settings\xxxx\Desktop\test_log.txt"

important = []
keep_phrases = ["test",
              "important",
              "keep me"]

with open(infile) as f:
    f = f.readlines()

for line in f:
    for phrase in keep_phrases:
        if phrase in line:
            important.append(line)
            break

print(important)

它绝不是完美的，例如没有异常处理或模式匹配，但您可以很容易地将它们添加到其中。查看正则表达式，这可能比短语匹配更好。如果您的文件非常大，请逐行读取它以避免 MemoryError。

输入文件:

This line is super important!
don't need this one...
keep me!
bla bla
not bothered
ALWAYS include this test line

输出:

['This line is super important!\n', 'keep me!\n', 'ALWAYS include this test line']

注意:这是 Python 3.3。