python logging¶
import logging
logging.basicConfig(filename = os.path.join(os.getcwd(), 'log.txt'), level = logging.DEBUG)
logging.debug('this is a message')
python get line num¶
f = open("test.txt")
for i, l in enumerate(f):
print i
python 脚本基本结构¶
import sys
source_file = sys.argv[1]
if __name__ == "__main__":
my_func(source_file)
python file¶
f = open(file, "a") ## a meaning append
f = open(file, "w") ## w meaning write
python 正则¶
import re
pattern = re.compile("[a-zA-Z]")
result = pattern.search("adsfuhefdfkj435")
print result.group()
python 下载静态文件，如,mp3¶
import urllib
urllib.urlretrieve(audio_url, "name.mp3")
升级pip¶
easy_install -U pip
dir()¶
- built-in function;
- return a list of valid attributes for an object;
- default: global objects
decode(), encode()¶
decode的作用是将其他编码的字符串转换成unicode编码，如str1.decode('gb2312')，表示将gb2312编码的字符串str1转换成unicode编码。
encode的作用是将unicode编码转换成其他编码的字符串，如str2.encode('gb2312')，表示将unicode编码的字符串str2转换成gb2312编码。