python--文件处理范例

import os,os.path,string

dir="D:\\curl\\data"
if (os.path.exists(dir)==False):
print "not exist,create"

long_time=[]

def func(a):
if a >=10:
return True
else:
return False

def func2(a):
if len(a.strip())==0:
return -1
b=a.rstrip('\n')
c=string.atof(b)
return c

os.chdir(dir)
for file in os.listdir(dir):
#print file
with open(file,'r') as f:
content = f.readlines()
if content!= []:
data=map(func2,content)
long=filter(func,data)
if long!=[]:
long_time.append(long)
f.close()

with open(r"d:/curl/long_time.txt",'w') as f:
print long_time
for data in long_time:
f.write(str(data[0]))
f.write("\n")