解析CSV和分析数据

Question

我做了一些通过黑客排名功课，但我似乎无法弄清楚它为什么不接受我的答案。

Here is the link to the original repository.

目标是打印有允许值的目标和目标之间的最小差的球队的名字。

似乎有两种可能，莱斯特和Aston_Villa因为莱斯特进球和目标之间不允许（-37）的负差，而Aston_Villa具有最小的绝对差值（-1）。但是，这些都不被接受。

任何想法，为什么？

import sys 
import os 
import csv 

text = '''Team,Games,Wins,Losses,Draws,Goals,Goals Allowed,Points 
Arsenal,38,26,9,3,79,36,87 
Liverpool,38,24,8,6,67,30,80 
Manchester United,38,24,5,9,87,45,77 
Newcastle,38,21,8,9,74,52,71 
Leeds,38,18,12,8,53,37,66 
Chelsea,38,17,13,8,66,38,64 
West_Ham,38,15,8,15,48,57,53 
Aston_Villa,38,12,14,12,46,47,50 
Tottenham,38,14,8,16,49,53,50 
Blackburn,38,12,10,16,55,51,46 
Southampton,38,12,9,17,46,54,45 
Middlesbrough,38,12,9,17,35,47,45 
Fulham,38,10,14,14,36,44,44 
Charlton,38,10,14,14,38,49,44 
Everton,38,11,10,17,45,57,43 
Bolton,38,9,13,16,44,62,40 
Sunderland,38,10,10,18,29,51,40 
Ipswich,38,9,9,20,41,64,36 
Derby,38,8,6,24,33,63,30 
Leicester,38,5,13,20,30,64,28''' 

with open('football.csv', 'w') as f: 
    f.write(text) 



def read_data(filename): 
    """Returns a list of lists representing the rows of the csv file data. 

    Arguments: filename is the name of a csv file (as a string) 
    Returns: list of lists of strings, where every line is split into a list of values. 
     ex: ['Arsenal', 38, 26, 9, 3, 79, 36, 87] 
    """ 
    ifile = open('football.csv', 'rt') 
    reader = csv.reader(ifile) 

    listed = [] 
    for row in reader: 
     print(row) 
     listed.append(row) 

    return listed 

data = read_data('football.csv') 

def get_index_with_min_abs_score_difference(goals): 
    net_goals = [] 

    for i in goals[1:]: 
     net_goals.append(int(i[5]) - int(i[6])) 

    return net_goals.index(min(net_goals))+1 

def get_team(index_value, parsed_data): 
    return parsed_data[index_value][0] 

footballTable = read_data('football.csv') 
minRow = get_index_with_min_abs_score_difference(footballTable) 
print(str(get_team(minRow, footballTable))) 

我也尝试了另一种解决方案（即团队允许的进球和目标之间的最小绝对差）。

def get_index_with_min_abs_score_difference(goals): 
    """Returns the index of the team with the smallest difference 
    between 'for' and 'against' goals, in terms of absolute value. 

    Arguments: parsed_data is a list of lists of cleaned strings 
    Returns: integer row index 
    """ 
    net_goals = [] 

    for i in goals[1:]: 
     net_goals.append(abs(int(i[5]) - int(i[6]))) 

    return net_goals.index(min(net_goals))+1 

Answer 1

这不完全是一个答案，而是我对你的解决方案有一些评论。

你花了一大堆行逐行阅读一个csv文件，只是把它放到一个列表中（稍后你会逐项处理），然后你有一些特殊的逻辑跳过标题行。如果你想使用csv.DictReader来代替你的解决方案，那么你的解决方案会简单得多，并且直接使用生成的迭代器，而不是先尝试将其读入列表中。考虑输出：

with open('football.csv', 'rt') as ifile:          
    footballTable = csv.DictReader(ifile)          
    for row in footballTable:             
     print row 

这将显示你的线沿线的东西：

{'Draws': '3', 'Wins': '26', 'Losses': '9', 'Goals Allowed': '36', 'Points': '87', 'Games': '38', 'Goals': '79', 'Team': 'Arsenal'} 
{'Draws': '6', 'Wins': '24', 'Losses': '8', 'Goals Allowed': '30', 'Points': '80', 'Games': '38', 'Goals': '67', 'Team': 'Liverpool'} 
{'Draws': '9', 'Wins': '24', 'Losses': '5', 'Goals Allowed': '45', 'Points': '77', 'Games': '38', 'Goals': '87', 'Team': 'Manchester United'} 
... 

你会注意到：

• 标题行自动为您办理
• 您现在可以通过名称引用列，而不需要依赖代码中的魔术索引（i[5]）。也就是说，您可以要求i['Goals']或i['Goals Allowed']。

在这个循环中只需要添加几行代码就可以解决您的问题。