Use of the Python dictionary

Dictionary:

#可以用大括号创建字典, can also be created with the factory function; cleese={} palin=dict () #给字典加入一些数据cleese [' Name '] = ' John Cleese ' cleese[' occupations '] = [' actor ', ' comedian ', ' writer ',] #查看里面有哪些数据项In [9]: Cleeseout[9]: {' Name ': ' John Cleese ', ' occupations ': [' actor ', ' comedian ', ' Writer ']}palin = {' Name ': ' Michael Palin ', ' occupations ': [' comedian ', ' actor ', ' writer ', ' TV ']}in [all]: palinout[11]: {' Name ': ' Michael Palin ', ' occupations ': [' comedian ', ' actor ', ' writer ', ' TV ']} #可以通过键来调用对应的数据In []: palin[' Name ']out[13 ]: ' Michael Palin ' #如果字典中一个键对应着多个数据项 can also be accessed using a list-like notation. In [all]: palin[' occupations '][-1]out[15]: ' TV ' in [+]: palin[' occupations '][1]out[16]: ' actor ' in [+]: palin[' Occupations '][0]out[17]: ' Comedian '

First, the following data processing, the output to retain the names of people and match data sorted by the top three items.

Sarah sweeney,2002-6-17,2:58,2.58,2:39,2-25,2-25,2:54,2.18,2:55,2:55

First edition code:

#!/usr/local/python3/bin/python3def 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_file_data (filename):    try:         with open (filename)  as f:             data = f.readline ()         return ( Data.strip (). Split (', '))     except IOError as ioerr:         print (' FILE&NBsp;error '  + str (ioerr))         return (None) sarah1 =  get_file_data (' Sarah2 ') #这里是将列表中前两项数据, names and birthdays pop into Sarah_name,sarah_dob two variables using pop. (SARAH_NAME,SARAH_DOB)  = sarah1.pop (0), Sarah1.pop (0) #这里要做字符串拼接, so after the subsequent sequence processing, you need to use STR () to convert to a string. Print (sarah_name +  "' S fastest times are:"  + str (Sorted (set ([ sanitize (i)  for i in sarah1 ])) [0:3]))

Output Result:

Sarah Sweeney ' s fastest times are:[' 2.18 ', ' 2.25 ', ' 2.39 '

Second, the function defined above is the same, we use the dictionary to complete the way

Second Edition code:

#!/usr/local/python3/bin/python3def 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_file_data (filename):    try:         with open (filename)  as f:             data = f.readline ()         return ( Data.strip (). Split (', '))     except IOError as ioerr:         print (' FILE&NBsp;error '  + str (ioerr))         return (None) sarah1 = The  get_file_data (' SARAH2 ') #定义字典sarah_dic the =dict () #将列表中前两个数据项, and the popup is saved to the corresponding key in the dictionary. sarah_dic[' name '] = sarah1.pop (0) sarah_dic[' dob '] = sarah1.pop (0) #姓名和日期都弹出了, The rest of the SARAH1 is the time data, saved in the Sarah_dic dictionary, the key is time;sarah_dic[' Times '] = sarah1print (sarah_dic[' name '] +   "' s fastest time are: "  + str (sorted (Set ([Sanitize (i)  for i  IN SARAH1])) [0:3])

The output is the same as above

Third, move the creation of the dictionary to the Get_file_data () function and return a dictionary instead of a list. And the data slice, to repeat the item, the sort also moves to the Get_file_data function, calls the function completes 4 contestant's achievement output.

The third version of the Code:

#!/usr/local/python3/bin/python3def 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_file_data (filename):    try:         with open (filename)  as f:             data = f.readline ()         templ  = data.strip (). Split (', ')         return ({' Name ': Templ.pop (0 ),       &Nbsp;          ' DOB ': Templ.pop (0),                  ' time ': Str (sorted (Set ([Sanitize (i)  for  i in templ]) ([0:3])})     except IOError as ioerr:         print (' File error '  + str (ioerr))          return (None) james1 = get_file_data (' James2 ') julie1 = get_ File_data (' Julie2 ') mikey1 = get_file_data (' Mikey2 ') sarah1 = get_file_data (' Sarah2 ') print ( james1[' name '] +  "' s fastest time are: "  + james1[' time ']) print (julie1 [' Name '] +  ' s fastest time are:  '  + julie1[' time ']) print (mikey1[' name '] +  ' ' s fastest time are:  '  + mikey1[' time ') print (sarah1[' name ')  +  "' S fastest time are:   + sarah1[' time ') 

Output Result:

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Difficulties:

Def get_file_data (filename):    try:         With open (filename)  as f:             data = f.readline ()         templ =  Data.strip (). Split (', ') #可以看到这里是返回字典了, found that even the dictionary name is not, directly return the key and the corresponding data.                 return ({' Name ' : Templ.pop (0),                 ' DOB ': Templ.pop (0),                  ' time ': Str (sorted (Set ([Sanitize (i)  for i in templ]) [0:3])})      Except ioerror as ioerr:        print (' File error '  + str (Ioerr))         reTurn (None)          #由于返回过来的直接是字典数据, here, with any variable function, will become a dictionary, The data corresponding to the function return key value is stored in the dictionary. James1 = get_file_data (' James2 ')      #这里就可以使用字典和键 ' james1[' name '] "to output the data. Print (james1[' name '] +  "' s fastest time are: "  + james1[' time '])

This article is from the "Break Comfort zone" blog, so be sure to keep this source http://tchuairen.blog.51cto.com/3848118/1678551

Use of the Python dictionary