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最常用的Python代码段

2021年11月26日7780百度已收录

最常用的Python代码段  Python常用代码 第1张

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"

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