通过建立继承内置list的类AthleteList，将方法定义在类中实现相同功能：
import os
print(os.getcwd())
os.chdir('C:Python33HeadFirstPythonhfpy_codechapter6') #将工作空间修改为文件所在的目录
#定义类AthleteList继承python内置的list
class AthleteList(list):
def __init__(self, name, dob=None, times=[]):
list.__init__([])
self.name=name
self.dob=dob
self.extend(times)
def get_prev_three(self):
return (sorted(set([modify_time_format(t) for t in self]))[0:3])
def get_filedata(filename):
try:
with open(filename) as f: #with语句打开和自动关闭文件
data=f.readline() #从文件中逐行读取字符
data_list=data.strip().split(',') #将字符间的空格清除后，用逗号分隔字符
return(
AthleteList(data_list.pop(0), data_list.pop(0), data_list)
) #使用字典将关联的姓名，出生年月，时间键和值进行存储并返回
except IOError as ioerr:
print ('File Error' + str(ioerr)) #异常处理，打印错误
return (None)
def modify_time_format(time_string):
if "-" in time_string:
splitter="-"
elif ":" in time_string:
splitter=":"
else:
splitter="."
(mins, secs)=time_string.split(splitter) #用分隔符splitter分隔字符后分别存入mins和secs
return (mins+ '.' +secs)
james = get_filedata('james2.txt')
print (james.name+"'s fastest times are: " + str(james.get_prev_three()))
julie = get_filedata('julie2.txt')
print (julie.name+"'s fastest times are: " + str(julie.get_prev_three()))
