下面是我寫的python的一個小腳本，作用是：判斷文本中的用戶名在數據庫中是否存在，存在返回1，不存在返回0.用的是MySQL數據庫。
要注意的是：strip函數的使用，該函數的作用是去除字符串兩端多余的whitespace。
所以strip的作用肯定不是像書上說的去除字符串兩端多余空格。
查了一下文檔說
Return a copy of the string with the leading and trailing characters removed. The chars argument is a string specifying the set of characters to be removed. If omitted or None, the chars argument defaults to removing whitespace.
該函數的作用是去除字符串兩端多余的whitespace
The most common whitespace characters may be typed via the space bar or the tab key. Depending on context, a line-break generated by the return or enter key may be considered whitespace as well.
whitespace應該是空格，Tab和換行的統稱，而不僅僅是空格。
ok，貼代碼吧！
!/usr/bin/python
#!Filename = username_indb.py
import MySQLdb
try:
conn=MySQLdb.connect(host = "localhost", user = "root", passwd ="123@qwe",db = "test",port = 3306)
cur=conn.cursor()
cur.execute("select username from userinfor")
result = cur.fetchall()
cur.close()
conn.close()
except MySQLdb.Error,e:
print "MySQLdb error %s :%s" %(e.args[0],e.args[1])
data=[]
#print result
for i in range(0,len(result)):
data.append(result[i][0])
#print data
for line in open("C:\Python27\scriptKing\username.txt"):
if line.strip() in data:
#tips:'line.strip()' is used to remove '/n'
print line,1
else:
print line,0