做性能测试时，往往需要大量的参数化数据，比如注册。

from random import Random

def random_str(randomlength=8):
str=''
chars='0123456789'
length=len(chars) -1
random=Random()
for i in range(randomlength):
str+=chars[random.randint(0,length)]
return str

li='1'

list=li.split(",")

fd2=open(r'C:/0427/test.txt',"a+")
for i in range(1,50000):

random0=random_str()
list[0]='111'+random0

list1=','.join(list)
fd2.writelines(list1)
fd2.writelines("\n")
fd2.flush()

print "sucess!"