Python异常可能是由于循环引起的

Question

我们的目标是遍历一个文件，找出进攻篮板排名前5的球队和球员。文件中包含多个团队玩的多个游戏。例如，灰熊对熊的比赛，有人可能从灰熊得到3个篮板，然后几百线下灰熊对鲨鱼，有人可能得到5个篮板。它的格式如下：'反跳（1）''反跳（2）''反跳（3）'等

目标是在循环中放置一个循环，循环遍历整个文件。我发现每场比赛最多的篮板是10个。我想添加一些变量（k）1-10，使它不那么草率（我想花时间说我意识到代码不是很好）。今晚我第一次坐下来看它，我对Python还比较陌生，当我得到一个完整的函数代码时，我会尽可能地修改它。。也许这样做不好，但我会这么做）。不幸的是，我得到了这个非常奇怪的错误，我粘贴在我的代码下面。你知道吗

import pandas as pd
import collections as c

fileRead = pd.read_csv('Sample.csv')

eventDescript = fileRead.event_desc.apply(str)
team = fileRead.team_name.apply(str)
player = fileRead.player_name.apply(str)
topTeams = []
topPlayers = []
i = 0

while (i != len(eventDescript)):
   # print eventDescript.where(eventDescript == 'Off Rebound (1)').dropna()
   for k in range(1,11):
       if eventDescript[i] == 'Off Rebound (' + str(k) + ')' and player[i] != 'nan':
           topTeams.append(team[i])
           topPlayers.append(player[i])
           i = i + 1
       else:
           i = i + 1
   i = i + 1

print c.Counter(topTeams).most_common(5)
print c.Counter(topPlayers).most_common(5)

runfile('/Users/air13/Downloads/untitled2.py', wdir='/Users/air13/Downloads')

错误： 回溯（最近一次呼叫）：

  File "<ipython-input-239-f1cd8a80a240>", line 1, in <module>
    runfile('/Users/air13/Downloads/untitled2.py', wdir='/Users/air13/Downloads')
  File "/Users/air13/anaconda/lib/python2.7/site-packages/spyder/utils/site/sitecustomize.py", line 866, in runfile
    execfile(filename, namespace)
  File "/Users/air13/anaconda/lib/python2.7/site-packages/spyder/utils/site/sitecustomize.py", line 94, in execfile
    builtins.execfile(filename, *where)
  File "/Users/air13/Downloads/untitled2.py", line 24, in <module>
    if eventDescript[i] == 'Off Rebound (' + str(k) + ')' and player[i] != 'nan':
  File "/Users/air13/anaconda/lib/python2.7/site-packages/pandas/core/series.py", line 603, in __getitem__
    result = self.index.get_value(self, key)
  File "/Users/air13/anaconda/lib/python2.7/site-packages/pandas/indexes/base.py", line 2169, in get_value
    tz=getattr(series.dtype, 'tz', None))
  File "pandas/index.pyx", line 98, in pandas.index.IndexEngine.get_value (pandas/index.c:3557)
  File "pandas/index.pyx", line 106, in pandas.index.IndexEngine.get_value (pandas/index.c:3240)
  File "pandas/index.pyx", line 154, in pandas.index.IndexEngine.get_loc (pandas/index.c:4279)
  File "pandas/src/hashtable_class_helper.pxi", line 404, in pandas.hashtable.Int64HashTable.get_item (pandas/hashtable.c:8564)
  File "pandas/src/hashtable_class_helper.pxi", line 410, in pandas.hashtable.Int64HashTable.get_item (pandas/hashtable.c:8508)
KeyError: 128651

Answer 1

行中出现错误： if eventDescript[i] == 'Off Rebound (' + str(k) + ')' and player[i] != 'nan': 这是一个键错误，因此在eventDescript或player字典中没有键i的值。 这是因为你使用了！=而不是while循环中的<；，并将i增加三倍，使i大于词典的长度。你知道吗

我会这样做：

import pandas as pd
import collections as c

fileRead = pd.read_csv('Sample.csv')

eventDescript = fileRead.event_desc.apply(str)
team = fileRead.team_name.apply(str)
player = fileRead.player_name.apply(str)
topTeams = []
topPlayers = []

for i in range(len(eventDescript)):
    # print eventDescript.where(eventDescript == 'Off Rebound (1)').dropna()
    if player[i] != 'nan':
        k = int(eventDescript[i].replace('Off Rebound (', '').replace(')', ''))
        if 1 <= k <= 10:
            topTeams.append(team[i])
            topPlayers.append(player[i])

print(c.Counter(topTeams).most_common(5))
print(c.Counter(topPlayers).most_common(5))

1. 如果可能的话，我建议您始终使用for循环，这样就不会发生这种错误。你知道吗
2. 你不需要第二圈。你知道吗
3. 你可以用i+=1代替i=i+1