AttributeError: 'Athlete' object has no attribute 'top3'

Traceback (most recent call last):
File "C:Libidlelib13.py", line 40, in <module>
print (james.top3())
AttributeError: 'Athlete' object has no attribute 'top3'

 1 class Athlete:
 2     def __init__ (self,a_name,a_dob = None,a_times =[]):
 3         self.name = a_name
 4         self.dob = a_dob
 5         self.times  = a_times
 6 
 7 def top(self):
 8     return(sorted(set([sanitize(t) for t in self.times]))[0:3])
 9 
10     
11 def sanitize(time_string):
12     if '-' in time_string:
13         splitter = '-'
14     elif ':' in time_string:
15         splitter = ':'
16     else :
17         return (time_string)
18     (mins,secs) = time_string.split(splitter)
19     return (mins + '.' +secs)
20 
21 def get_coach_data (filename):
22     try:
23         with open (filename) as f:
24             data =f.readline()
25         templ = data.strip().split(',')
26         return(Athlete(templ.pop(0),templ.pop(0),templ))
27     except IOError as ioerr:
28         print('File Error' + str(ioerr))
29         return(None)
30 
31 def add_time(self,time_value):
32     self.times.append(time_value)
33 
34 def add_times(self,list_of_times):
35     self.times.extend(list_of_tiems)
36 
37 james = get_coach_data('james2.txt')  
38 print (str(james.top()))

修改错误的方法：

1 class Athlete:
2     def __init__ (self,a_name,a_dob = None,a_times =[]):
3         self.name = a_name
4         self.dob = a_dob
5         self.times  = a_times
6 
7     def top(self):
8         return(sorted(set([sanitize(t) for t in self.times]))[0:3])

def top3(self) 前面加Tab

格式！！！