1. 迭代删除重复项：先排序列表项，然后通过新迭代(not in)去除重复项，分片打印

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)

with open ('james.txt') as jas: data = jas.readline()

james=data.strip().split(',')

print('before sort and senitize, unique for james',james)

james=sorted ([sanitize(t) for t in james])

unique_james=[]

for each_t in james:

if each_t not in unique_james:

unique_james.append(each_t)

print('First 3 time for james',unique_james[0:3])

=========== RESTART: C:\Users\eric\Documents\Python\kelly\kelly.py ===========

before sort and senitize, unique for james ['2-34', '3:21', '2.34', '2.45', '3.01', '2:01', '2:01', '3:10', '2-22']

First 3 time for james ['2.01', '2.22', '2.34']

2. 集合删除重复项：先set创建集合去除重复项，然后进行排序，分片打印

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)

with open ('james.txt') as jas: data = jas.readline()

james=data.strip().split(',')

print('before sort and senitize, unique for james',james)

james=sorted (set([sanitize(t) for t in james]))

print('First 3 time for james',james[0:3])

=========== RESTART: C:\Users\eric\Documents\Python\kelly\kelly.py ===========

before sort and senitize, unique for james ['2-34', '3:21', '2.34', '2.45', '3.01', '2:01', '2:01', '3:10', '2-22']

First 3 time for james ['2.01', '2.22', '2.34']

3.精简代码，创建一个小函数rmspace去除空白符，通过函数调用分片打印

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 rmspace(file):

with open(file) as fo: data=fo.readline()

return data.strip().split(',')

james=rmspace('james.txt')

print('before sort and senitize, unique for james',james)

print('First 3 time for james',sorted(set([sanitize(t) for t in james]))[0:3])

=========== RESTART: C:\Users\eric\Documents\Python\kelly\kelly.py ===========

before sort and senitize, unique for james ['2-34', '3:21', '2.34', '2.45', '3.01', '2:01', '2:01', '3:10', '2-22']

First 3 time for james ['2.01', '2.22', '2.34']