这些常用的代码段可以让不懂Python的人感受到Python的魅力, 同时让编写啰里啰嗦语言的人们看到未来。
过滤列表
#filter out empty strings in a sting list
list = [x for x in list if x.strip()!='']
一行一行地读文件
with open("/path/to/file") as f:for line in f:print line
逐行写文件
f = open("/path/tofile", 'w')
for e in aList: f.write(e + "\n")f.close()
正则匹配查找
sentence = "this is a test, not testing."it = re.finditer('\\btest\\b', sentence)for match in it:print "match position: " + str(match.start()) +"-"+ str(match.end())
正则匹配搜索
m . line m: current m.
查询数据库
db = MySQLdb.connect("localhost","username","password","dbname")cursor = db.cursor()sql = "select Column1,Column2 from Table1"cursor.execute(sql)results = cursor.fetchall()
for row in results:print row[0]+row[1] db.close()
用指定字符连接列表
theList = ["a","b","c"]joinedString = ",".join(theList)
去除重复元素
targetList = list(set(targetList))
在一列字符串中去除空字符串
targetList = [v for v in targetList if not v.strip()=='']# ortargetList = filter(lambda x: len(x)>0, targetList)
将一个列表连接到另一个列表后面
anotherList.extend(aList)
遍历一个字典
for k,v in aDict.iteritems():print k+v
检查一列字符串中是否有任何一个出现在指定字符串里
if any(x in targetString for x in aList):print "true"
