这应该使您入门不错：
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，但是您可以很容易地将它们添加到其中。查看正则表达式，这可能比词组匹配更好。如果文件很大，请逐行读取它，以避免出现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。
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