python学习笔记四

数据处理

 

1.原地排序：list.sort

2.复制排序：sorted

3.方法串联：line.strip().split()

4.函数串联：sort(foo(list.item))

5.列表转换：newl=[ s.upper() for s in old_l]

6.工厂函数:  uniq_newl=set(newl)

7.分片:print(newl[0:3])

 

 

 

import os

dataPath="F:\book\python\headfirst python book&&code\code\chapter5\data"


def sanitize(time_string):
    if ":" in time_string:
        min,sec=time_string.split(":")
    elif "-" in time_string:
        min,sec=time_string.split("-")

    if 'min' in locals():
        return min+"."+sec
    else:
        return time_string

try:
   
    fileList=os.listdir(dataPath)
    fileData=[]
    for fileName in fileList:
        print(fileName)
        listData=[]
        with open(fileName) as dataout:
            line=dataout.readline()
            """
            for word in line.strip().split(","):
                listData.append(sanitize(word))
            """
            #转换列表
            listData=[sanitize(each_it) for each_it in line.strip().split(",")]
        fileData.append(listData)


 
    for data in fileData:
        #删除重复数据
        """
        tmplist=[]
        for item in data:
            if item not in tmplist:
                tmplist.append(item)
        """
        tmplist=set(data) #自动删除重复数据
        print(sorted(tmplist)[0:3])

except IOError as err:

    print("IOError:"+err)