[英]How do you group name's in python?
我有兩個列表,一個用於名稱,一個用於分數,其中一些名稱是相同的,我只需要命名一個名稱,然后將與該名稱相關的所有分數平均取為一個與之相關的分數。 但它運行太多次,並因該錯誤消息而崩潰
Traceback (most recent call last):
File "N:\.idlerc\tester.py", line 12, in <module>
while l[i+j]==currentname:
IndexError: list index out of range
但是,如果我使循環更短,它也不起作用
這是我到目前為止的內容:
l=['bob','bob','dan','dan','dan']
s=[2,4,4,8,7]
averagelist=[]
averagescores=[]
i=0
while i<len(l)-1:
currentname=l[i]
score=0
j=0
while l[i+j]==currentname:
score=score+s[i+j]
j=j+1
#print(currentname)
#print('j',j)
#print('i',i)
#print('scores',score)
averagelist.append(currentname)
averagescores.append(score/j)
i=i+j
#print('i',i)
print(averagelist)
print(averagescores)
看起來最好為此使用字典:
l=['bob','bob','dan','dan','dan']
s=[2,4,4,8,7]
scores_per_person = {}
for i,name in enumerate(l): #assuming both lists are of the same length
scores_per_person.setdefault(name,[]).append(s[i])
for name,scores_list in scores_per_person.iteritems():
average_score = sum(scores_list)/float(len(scores_list))
print "The average for %s is %f"%(name,average_score)
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