求python脚本，从txt检索出特定字符的行（有很多行，行里面有记录的时间），并从行中抓出对应的时间字符 Python如何从一个txt文件中挑出所有带有‘asd’的行...
python \u95ee\u9898 \u6709\u4eba\u77e5\u9053\u600e\u4e48\u8f93\u51fa\u6587\u4ef6\u4e2d\u6bcf\u884c\u9996\u5b57\u7b26\u548c\u5c3e\u5b57\u7b26\u4e92\u6362\u7684\u884c\u201d \u5417\uff1f# -*- coding: cp936 -*-
f=open("test.txt")
for line in f:
norn=line.rstrip()#\u53bb\u9664\u884c\u5c3e\u7a7a\u767d\u5b57\u7b26\u3002
newline=norn[-1]+norn[1:-1]+norn[0]#\u4ea4\u6362\u9996\u5c3e\u5b57\u7b26
print newline
\u5c11\u5973\u5904\u5973\u6740\u624b\u7684\u56de\u7b54\uff0c\u6709\u591a\u5904\u9519\u8bef\uff1a
1. file\u662f\u5185\u7f6e\u51fd\u7d22\u548copen\u529f\u80fd\u4e00\u6837\u3002
2.\u5e94\u8be5\u7ed9r\u52a0\u4e0a\u5f15\u53f7
3.\u5b57\u7b26\u662f\u4e0d\u53ef\u53d8\uff0c\u4e0d\u53ef\u4ee5\u539f\u5730\u4fee\u6539,list[0]="xxx"\u8fd9\u6837\u662f\u4e0d\u884c\u7684\u3002
# -*- coding: utf-8 -*-""":created on: 2015\u5e747\u670813\u65e5:copyright: Nokia Solutions and Networks:author: Chuanqing Qin:contact: [email protected]"""import reimport osif __name__ == '__main__': counter = 0 with open('test.txt', 'r') as f: for line in f: if re.findall(r'.*asd.*', line): counter += 1 print counter
逐行匹配。对于每行可以首先使用find来确定该行中有没有特定字符。如果有，则根据正则表达式从中提取时间字符。
以下举一个例子，假设特定字符串为name，时间格式为xxxx-xx-xx。
def main():
import re
time_format = "\d+-\d+-\d+" #时间格式
special_string = "name" #特定字符串
pattern = re.compile(time_format)
txt_content = open("test.txt", "r")
for line in txt_content:
l = line.strip()
if l.find(special_string)>=0: #如果有特定字符串
print l #打印对应的行
match =pattern.match(l) #如果有匹配的时间格式
if match:
print match.group() #打印对应的时间
if __name__ == '__main__':
main()
样例test.txt为
2014-2-11 Your behavior is causing our name to be dragged through the mud.
2014-2-12 I am so happy to get munificent birthday presents from my friends.
2014-2-13 He's the boss in name only, because I issue all the orders.
2014-2-14 We are happy to give the product our full endorsement.
2014-2-15 His name leaped out at me from the book.
2014-2-16 We'll be happy to help if you need us.
输出结果为
2014-2-11 Your behavior is causing our name to be dragged through the mud.
2014-2-11
2014-2-13 He's the boss in name only, because I issue all the orders.
2014-2-13
2014-2-15 His name leaped out at me from the book.
2014-2-15
你至少应该贴几行你文件的内容吧？
时间什么格式啊？
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