python startswith与endswith

如果你要用python匹配字符串的开头或末尾是否包含一个字符串，就可以用startswith,和endswith
比如:content = 'ilovepython'
如果字符串content以ilove开始，返回True，否则返回False
content.startswith("ilove")
返回true
content.startswith("sss")
返回false

如果字符串content以python结尾，返回True，否则返回False
content.endswith('python')
返回true
content.endswith("sss")
返回false

下面这个例子是我写了个文件替换的小程序。替换所有.html文件里的图片的路径

import os
import re
t = re.compile(r'\/?static\/|\/?media\/') #re.compile

template = '/home/laowangpython/'
for root, dirs, files in os.walk(template):
    for f in files:
        if f.endswith('.html'):
            tihuan = 'http://www.cnpythoner.com/'
            filename = '%s'%(os.path.join(root,f))
            print filename
            f_a = file(filename,'r')
            info = []
            for i in f_a:
                content =  t.sub(tihuan,i)
                info.append(content)
            finfo = "".join(info)
            b = file(filename,'w')
            b.write(finfo)