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")

读取某个文件夹下所有文件