這些常用的代碼段可以讓不懂Python的人感受到Python的魅力, 同時(shí)讓編寫啰里啰嗦語(yǔ)言的人們看到未來(lái)~~  更快地了解Python, 加入Python部落(www.freelycode.com)

過(guò)濾列表

#filter out empty strings in a sting list
list = [x for x in list if x.strip()!='']

一行一行地讀文件

with open('/path/to/file') as f:
   for line in f:
       print line

逐行寫文件

f = open('/path/tofile', 'w')
for e in aList:    f.write(e + '\n')f.close()

正則匹配查找

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())

正則匹配搜索

m = re.search('\d+-\d+', line) #search 123-123 like strings
if m: current = m.group(0)

查詢數(shù)據(jù)庫(kù)

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()

用指定字符連接列表

theList = ['a','b','c']
joinedString = ','.join(theList)

去除重復(fù)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)

將一個(gè)列表連接到另一個(gè)列表后面

anotherList.extend(aList)

遍歷一個(gè)字典

for k,v in aDict.iteritems():
   print k+v

檢查一列字符串中是否有任何一個(gè)出現(xiàn)在指定字符串里

if any(x in targetString for x in aList):
   print 'true'