为什么我得到这个错误？ KeyError：“没有”

Question

我使用Alko的代码Expanding English language contractions in Python

我添加了一个位代码。我不明白为什么我收到此=> KeyError异常：“没有”

import re 
import csv 
fileLocation = 'test.csv' 
cList = { 
    "ain't": "am not", 
    "aren't": "are not", 
    "can't": "cannot", 
    "can't've": "cannot have", 
    "'cause": "because", 
    "could've": "could have", 
    "couldn't": "could not", 
    "couldn't've": "could not have", 
    "didn't": "did not", 
    "doesn't": "does not", 

     } 
R = re.compile('(%s)' % '|'.join(cList.keys()),re.IGNORECASE) 
read = csv.reader(open(fileLocation)) 
aList = [] 
def expandContractions(text,R=R): 
    def replace(match): 
     return cList[match.group(0)] 
    return R.sub(replace, text)  
for i in read: 
    aList.append(i[5]) 
for j in aList: 
    print(expandContractions(j)) 

Answer 1

而不是使用re.IGNORECASE和使用在你的钥匙.lower()的，要么始终小写的输入字符串：

• return R.sub(replace, text.lower()) in expandContractions;或
• print(expandContractions(j.lower()))

或大写和标题的情况下可能添加到您的CLIST词典：

cList = { 
... 
'DID NOT': "DIDN'T" 
'Did not': "Didn't" 
... 
} 

哪一个选项，你让取决于你想要得到的收缩，做什么，以及如何处理完全混乱的案例，如。