我如何劃分列表分爲smallers列表

Question

我的目錄的格式如下：

gymnastics_school,participant_name,all-around_points_earned 

我需要學校把它瓜分，但保持得分。

import collections 

def main(): 
    names = ["gymnastics_school", "participant_name", "all_around_points_earned"] 
    Data = collections.namedtuple("Data", names)  
    data = [] 

    with open('state_meet.txt','r') as f: 
     for line in f: 
      line = line.strip() 
      items = line.split(',') 
      items[2] = float(items[2]) 
      data.append(Data(*items)) 

這些都是它們是如何設置的例子：

Lanier City Gymnastics,Ben W.,55.301 
Lanier City Gymnastics,Alex W.,54.801 
Lanier City Gymnastics,Sky T.,51.2 
Lanier City Gymnastics,William G.,47.3 
Carrollton Boys,Cameron M.,61.6 
Carrollton Boys,Zachary W.,58.7 
Carrollton Boys,Samuel B.,58.6 
La Fayette Boys,Nate S.,63 
La Fayette Boys,Kaden C.,62 
La Fayette Boys,Cohan S.,59.1 
La Fayette Boys,Cooper J.,56.101 
La Fayette Boys,Avi F.,53.401 
La Fayette Boys,Frederic T.,53.201 
Columbus,Noah B.,50.3 
Savannah Metro,Levi B.,52.801 
Savannah Metro,Taylan T.,52 
Savannah Metro,Jacob S.,51.5 
SAAB Gymnastics,Dawson B.,58.1 
SAAB Gymnastics,Dean S.,57.901 
SAAB Gymnastics,William L.,57.101 
SAAB Gymnastics,Lex L.,52.501 
Suwanee Gymnastics,Colin K.,57.3 
Suwanee Gymnastics,Matthew B.,53.201 

處理它應該看起來像後：

Lanier City Gymnastics:participants(4) 

，因爲它自己的名單

Carrollton Boys(3) 

作爲它自己的名單

La Fayette Boys(6) 

等

Answer 1

我會建議他們將在dictionaries：

data = {} 

with open('state_meet.txt','r') as f: 
    for line in f: 
     line = line.strip() 
     items = line.split(',') 
     items[2] = float(items[2]) 
     if items[0] in data: 
      data[items[0]].append(items[1:]) 
     else: 
      data[items[0]] = [items[1:]] 

然後進入學校可以通過以下方式進行：

>>> data['Lanier City Gymnastics'] 
[['Ben W.',55.301],['Alex W.',54.801],['Sky T'.,51.2],['William G.',47.3] 

編輯： 假設您需要整個數據集作爲一個列表，然後再要將其分割成更小的列表中，您可以生成從列表中詞典：

data = [] 

with open('state_meet.txt','r') as f: 
    for line in f: 
     line = line.strip() 
     items = line.split(',') 
     items[2] = float(items[2]) 
     data.append(items) 

#perform median or other operation on your data 

nested_data = {}   
for items in data: 
    if items[0] in data: 
     data[items[0]].append(items[1:]) 
    else: 
     data[items[0]] = [items[1:]] 

    nested_data[item[0]] 

當你需要讓你可以用切片列表的一個子集：

mylist[start:stop:step] 

其中start，stop和step是可選的（見link更全面的介紹）