Question

所以我需要编写一个程序来计算文件中所有单词的平均单词长度。到目前为止，我有这个，我完全失去了

newfile=input('Enter file name: ')
f=open(newfile,'r')
count1=0
count2=0
for line in f:
    count1+=1
    words=line.rstrip().split()
for word in words:
    count2+=1
average=count1/count2
print('Average words per line: ',average)

Answer 1

w _i =单词i的长度

w _avg =Σw_i / N

with open(input('Enter file name: '),'r') as f:
    w = [len(word) for line in f for word in line.rstrip().split(" ")]
    w_avg = sum(w)/len(w)

Answer 2

问题是你从未真正计算过一个单词的长度。你可以做的是嵌套for循环：

for line in f:
     for word in line.split():

然后递增计数器

       count1+=1
       count2+=len(word)   # len(word) gives you the length exactly

最后，确保在计算平均值时进行浮点除法（而不是整数除法）：

average=float(count2)/float(count1)

我复制并解释您的原始代码，以便您了解出现了什么问题：

newfile=input('Enter file name: ')
f=open(newfile,'r')
count1=0
count2=0
for line in f:                             # here, line is a string containing many words
    count1+=1                       
    words=line.rstrip().split()            # here, "words" is a LIST of words
                                           # you exit your for loop here
                                           # so far, you looped over all your lines and did nothing with them
                                           # and in your "words" variable, only the last line will be stored


for word in words:                         # here, "word" is a word
    count2+=1                              # you increment the counter with one, not with the word's length
average=count1/count2                      # here, you perform integer division, and will lose the real part of the result
print('Average words per line: ',average)

Answer 3

至于Python 2.7：

f = open('mercy.txt', 'r')

w = [len(word) for line in f for word in line.rstrip().split(" ")]
important to convert to float!
w_avg = float(sum(w))/float(len(w))

print 'Average word length: ', w_avg)
f.close()

计算文件中所有单词的平均字长？

3 个答案: