[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])})

 1 def sanitize(time_string):
 2     if ‘-‘ in time_string:
 3         splitter = ‘-‘
 4     elif ‘:‘ in time_string:
 5         splitter = ‘:‘
 6     else:
 7         return (time_string)
 8
 9     (mins, secs) = time_string.split(splitter)
10     return(mins + ‘.‘ + secs)
11
12 def get_coach_data(filename):
13     try:
14         with open(filename) as f:
15             data = f.readline()
16             data_list = data.strip().split(‘,‘)
17             return({‘Name‘:data_list.pop(0),
18                     ‘DOB‘:data_list.pop(0),
19                     ‘Time‘:str( sorted( set([sanitize(t) for t in data_list]  ) )[0:3])})
20     except IOError as err:
21         print("file err:" + str(err))
22         return(none)
23
24
25 julie = get_coach_data(‘julie2.txt‘)
26 james = get_coach_data(‘james2.txt‘)
27 sarah = get_coach_data(‘sarah2.txt‘)
28 mikey = get_coach_data(‘mikey2.txt‘)
29
30 print( julie[‘Name‘] + "‘s faster time are:" + julie[‘Time‘])
31 print( james[‘Name‘] + "‘s faster time are:" + james[‘Time‘])
32 print( sarah[‘Name‘] + "‘s faster time are:" + sarah[‘Time‘])
33 print( mikey[‘Name‘] + "‘s faster time are:" + mikey[‘Time‘])

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

 1 def sanitize(time_string):
 2     if ‘-‘ in time_string:
 3         splitter = ‘-‘
 4     elif ‘:‘ in time_string:
 5         splitter = ‘:‘
 6     else:
 7         return(time_string)
 8
 9     (mins, secs) = time_string.split(splitter)
10     return(mins + "." + secs)
11
12 class Athlete:
13     def __init__(self, a_name, a_dob = None, a_time = []):
14         self.name = a_name
15         self.dob = a_dob
16         self.times = a_time
17
18     def top3(self):
19         return( sorted(set([sanitize(t) for t in self.times]))[0:3] )
20
21     def add_time(self,time_value):
22         self.times.append(time_value)
23
24     def add_times(self,list_of_times):
25         self.times.extend(list_of_times)
26
27
28 def get_coach_data(filename):
29     try:
30         with open(filename) as f:
31             data = f.readline();
32             datalist = data.strip().split(‘,‘)
33             return ( Athlete(datalist.pop(0), datalist.pop(0), datalist))
34     except IOError as err:
35         print(‘file err:‘ + str(err))
36         return(none)
37
38
39 julie = get_coach_data(‘julie2.txt‘)
40 james = get_coach_data(‘james2.txt‘)
41 sarah = get_coach_data(‘sarah2.txt‘)
42 mikey = get_coach_data(‘mikey2.txt‘)
43
44 print(julie.name + "‘s faster times are:" + str(julie.top3()))
45 print(james.name + "‘s faster times are:" + str(james.top3()))
46 print(sarah.name + "‘s faster times are:" + str(sarah.top3()))
47 print(mikey.name + "‘s faster times are:" + str(mikey.top3()))
48
49 vera = Athlete(‘vera vi‘)
50 vera.add_time(‘1.30‘)
51 print(vera.top3())
52 vera.add_times([‘1.00‘,‘0.3‘,‘1.2‘])
53 print(vera.top3())

3- 继承python内置list

 1 class Athletelist(list):
 2     def __init__(self, a_name, a_dob = None, a_times = []):
 3         list.__init__([])
 4         self.name = a_name
 5         self.dob = a_dob
 6         self.extend(a_times)
 7     def top3(self):
 8         return( sorted( set([sanitize(t) for t in self] ) )[0:3])
 9
10 def sanitize(time_string):
11     if ‘-‘ in time_string:
12         splitter = ‘-‘
13     elif ‘:‘ in time_string:
14         splitter = ‘:‘
15     else:
16         return(time_string)
17
18     (mins, secs) = time_string.split(splitter)
19     return(mins + "." + secs)
20
21 #vera = Athletelist("vera vi")
22 #vera.append(‘1.31‘)
23 #print(vera.top3())
24 #vera.extend(["1","2","0"])
25 #print(vera.top3())
26
27 def get_coach_data(filename):
28     try:
29         with open(filename) as f:
30             data = f.readline();
31             datalist = data.strip().split(‘,‘)
32             return ( Athletelist(datalist.pop(0), datalist.pop(0), datalist))
33     except IOError as err:
34         print(‘file err:‘ + str(err))
35         return(none)
36
37
38 julie = get_coach_data(‘julie2.txt‘)
39 james = get_coach_data(‘james2.txt‘)
40 sarah = get_coach_data(‘sarah2.txt‘)
41 mikey = get_coach_data(‘mikey2.txt‘)
42
43 print(julie.name + "‘s faster times are:" + str(julie.top3()))
44 print(james.name + "‘s faster times are:" + str(james.top3()))
45 print(sarah.name + "‘s faster times are:" + str(sarah.top3()))
46 print(mikey.name + "‘s faster times are:" + str(mikey.top3()))

[Head First Python]6. 定制数据对象:打包代码与数据