[Head First Python]6. 定制数据对象:打包代码与数据

相同功能,演进实现

数据文件

sarah2.txt

sarah Sweeney,2002-6-17,2:58,2.58,2:39,2-25,2-55,2:54,2.18,2:55,2:55

1- 返回dict

return({'Name':data_list.pop(0),

'DOB':data_list.pop(0),

'Time':str( sorted( set([sanitize(t) for t in data_list] ) )[0:3])})

 def sanitize(time_string):
     if '-' in time_string:
         splitter = '-'
     elif ':' in time_string:
         splitter = ':'
     else:
         return (time_string)

     (mins, secs) = time_string.split(splitter)
     return(mins + '.' + secs)

 def get_coach_data(filename):
     try:
         with open(filename) as f:
             data = f.readline()
             data_list = data.strip().split(',')
             return({'Name':data_list.pop(0),
                     'DOB':data_list.pop(0),
                     'Time':str( sorted( set([sanitize(t) for t in data_list]  ) )[0:3])})
     except IOError as err:
         print("file err:" + str(err))
         return(none)

 julie = get_coach_data('julie2.txt')
 james = get_coach_data('james2.txt')
 sarah = get_coach_data('sarah2.txt')
 mikey = get_coach_data('mikey2.txt')

 print( julie['Name'] + "'s faster time are:" + julie['Time'])
 print( james['Name'] + "'s faster time are:" + james['Time'])
 print( sarah['Name'] + "'s faster time are:" + sarah['Time'])
 print( mikey['Name'] + "'s faster time are:" + mikey['Time'])

2- 返回类  return ( Athlete(datalist.pop(0), datalist.pop(0), datalist))

 def sanitize(time_string):
     if '-' in time_string:
         splitter = '-'
     elif ':' in time_string:
         splitter = ':'
     else:
         return(time_string)

     (mins, secs) = time_string.split(splitter)
     return(mins + "." + secs)

 class Athlete:
     def __init__(self, a_name, a_dob = None, a_time = []):
         self.name = a_name
         self.dob = a_dob
         self.times = a_time

     def top3(self):
         return( sorted(set([sanitize(t) for t in self.times]))[0:3] )

     def add_time(self,time_value):
         self.times.append(time_value)

     def add_times(self,list_of_times):
         self.times.extend(list_of_times)

 def get_coach_data(filename):
     try:
         with open(filename) as f:
             data = f.readline();
             datalist = data.strip().split(',')
             return ( Athlete(datalist.pop(0), datalist.pop(0), datalist))
     except IOError as err:
         print('file err:' + str(err))
         return(none)

 julie = get_coach_data('julie2.txt')
 james = get_coach_data('james2.txt')
 sarah = get_coach_data('sarah2.txt')
 mikey = get_coach_data('mikey2.txt')

 print(julie.name + "'s faster times are:" + str(julie.top3()))
 print(james.name + "'s faster times are:" + str(james.top3()))
 print(sarah.name + "'s faster times are:" + str(sarah.top3()))
 print(mikey.name + "'s faster times are:" + str(mikey.top3()))

 vera = Athlete('vera vi')
 vera.add_time('1.30')
 print(vera.top3())
 vera.add_times(['1.00','0.3','1.2'])
 print(vera.top3())

3- 继承python内置list

 class Athletelist(list):
     def __init__(self, a_name, a_dob = None, a_times = []):
         list.__init__([])
         self.name = a_name
         self.dob = a_dob
         self.extend(a_times)
     def top3(self):
         return( sorted( set([sanitize(t) for t in self] ) )[0:3])

 def sanitize(time_string):
     if '-' in time_string:
         splitter = '-'
     elif ':' in time_string:
         splitter = ':'
     else:
         return(time_string)

     (mins, secs) = time_string.split(splitter)
     return(mins + "." + secs)

 #vera = Athletelist("vera vi")
 #vera.append('1.31')
 #print(vera.top3())
 #vera.extend(["1","2","0"])
 #print(vera.top3())

 def get_coach_data(filename):
     try:
         with open(filename) as f:
             data = f.readline();
             datalist = data.strip().split(',')
             return ( Athletelist(datalist.pop(0), datalist.pop(0), datalist))
     except IOError as err:
         print('file err:' + str(err))
         return(none)

 julie = get_coach_data('julie2.txt')
 james = get_coach_data('james2.txt')
 sarah = get_coach_data('sarah2.txt')
 mikey = get_coach_data('mikey2.txt')

 print(julie.name + "'s faster times are:" + str(julie.top3()))
 print(james.name + "'s faster times are:" + str(james.top3()))
 print(sarah.name + "'s faster times are:" + str(sarah.top3()))
 print(mikey.name + "'s faster times are:" + str(mikey.top3()))