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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~~ 更快地了解Python, 加入Python部落(www.freelycode.com)
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 = re.search('\d+-\d+', line) #search 123-123 like strings
if m: current = m.group(0)
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()=='']
# or
targetList = 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'
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