Question

当我运行当前代码时，我得到一个TypeError：'NoneType'对象不可迭代。具体来说，main函数中的mostword = wordcount（wordlist）第62行，以及我在第19行的wordlist中为x添加的位置。你能否帮我弄清楚我哪里出错了？

def getwords():

#function to get words in the input file
try:
    fp=open("sample.txt",'r')
except IOError:
    print('Unable to open file')
    return
words=[]
#read the file line by line
for line in fp:
    #convert each line into words with space as delimiter
    words=words+line.split()
return words


def wordcount(wordlist):

#function to count words in the file
#worddic is dictionary to store words frequency
worddic=dict()
for x in wordlist:
    #convert word to lowercase to ignorecase
    t=x.lower()
    if(t not in worddic):
        worddic[t]=0
    worddic[t]=worddic[t]+1
max=-1
t=''
for x in worddic:
    if(worddic[x]>max):
        max=worddic[x]
        t=x
return t

def letters(wordlist,lettercount):

#function to count letters in the file
for x in wordlist:
    #For each word in the list
    t=x.lower()
    for y in t:
        #for each letter in the word
        if(not (y in lettercount)):
            #if the letter is not in dictionary add it
            #and set frequency to zero
            lettercount[y]=0
        #increment the frequency of letter in dictionary
        lettercount[y] = lettercount[y]+1

def createoutput(lettercount,wordlist,mostword):

#creates an empty file 'statistics.txt'
try:
    fout=open("statistics.txt",'w+')
except IOError:
    print('Unable to create file')
fout.write('Number of words in the file are '+str(len(wordlist))+'\n')
fout.write('Most repeated word in the file is '+mostword+'\n')
for x in lettercount:
    #write to the file 'statistics.txt'
    fout.write(x+' appeared in the file for '+str(lettercount[x])+'   times \n')

def main():

wordlist=getwords()
#lettercount is a dictionary with letters as keys
#and their frequency in the input file as data
lettercount=dict()
mostword=wordcount(wordlist)
letters(wordlist,lettercount)
createoutput(lettercount,wordlist,mostword)
main()

提前致谢。非常感激。

Answer 1

我假设得到的单词没有返回数组中的任何内容，因为你错误地追加了这些行。在返回之前添加打印文字。当你调用get wordcount函数时，它回复没有类型是不可迭代的。而不是words = words.line.split()，使用append函数。 words.append(line.split())

Answer 2

在<{em> words块后，您在函数getwords 中声明try/except。如果引发IOException，则只需return。这将在失败的None上返回open。将words = []移至try/except。

之前
此代码应该现在，离开return words不会出现异常。

def getwords(): #function to get words in the input file words = [] try: fp = open("sample.txt", "r") except IOError: return words #read the file line by line for line in fp: #convert each line into words with space as delimiter words=words+line.split() return words def wordcount(wordlist): #function to count words in the file #worddic is dictionary to store words frequency worddic=dict() for x in wordlist: #convert word to lowercase to ignorecase t=x.lower() if(t not in worddic): worddic[t]=0 worddic[t]=worddic[t]+1 max=-1 t='' for x in worddic: if(worddic[x]>max): max=worddic[x] t=x return t def letters(wordlist,lettercount): #function to count letters in the file for x in wordlist: #For each word in the list t=x.lower() for y in t: #for each letter in the word if(not (y in lettercount)): #if the letter is not in dictionary add it #and set frequency to zero lettercount[y]=0 #increment the frequency of letter in dictionary lettercount[y] = lettercount[y]+1 def createoutput(lettercount,wordlist,mostword): #creates an empty file 'statistics.txt' try: fout=open("statistics.txt",'w+') except IOError: print('Unable to create file') fout.write('Number of words in the file are '+str(len(wordlist))+'\n') fout.write('Most repeated word in the file is '+mostword+'\n') for x in lettercount: #write to the file 'statistics.txt' fout.write(x+' appeared in the file for '+str(lettercount[x])+' times \n') def main(): wordlist=getwords() #lettercount is a dictionary with letters as keys #and their frequency in the input file as data lettercount=dict() mostword=wordcount(wordlist) letters(wordlist,lettercount) createoutput(lettercount,wordlist,mostword) main()

TypeError：对于单词计数程序，'NoneType'对象不可迭代

2 个答案: