我正在尝试在 TextWrangler 应用程序中使用 Python 读取、附加和排序文件中的所有单词。

Question

Question : Open the file romeo.txt and read it line by line. For each line, split the line into a list of words using the split() method. The program should build a list of words. For each word on each line check to see if the word is already in the list and if not append it to the list. When the program completes, sort and print the resulting words in alphabetical order.

fname = raw_input('Enter the file name: ')
file = open(fname)
romeo = list()
for line in file:   
    words = line.split()    
    for current_word in words : 
        if current_word in romeo:   
            continue
        romeo.append(current_word)
print romeo.sort()

I am getting an output of "None". I am not sure what I am doing wrong This link is where the romeo.txt file is found.

Answer 1

The reason why you are getting None is because romeo.sort() does the sorting in place, so it actually returns nothing. You have to actually just print romeo after you call romeo.sort() .

So, instead of printing romeo.sort() , just print:

print(romeo)

Answer 2

Without continue :

fname = raw_input("Enter file name: ")
fh = open(fname)
lst = list()
for line in fh:
    word = line.split()
    for item in word:
      if item not in lst:
            lst.append(item)
            lst.sort()
print(lst)

Answer 3

fname = input("Enter file name: ")

fh = open(fname)

lst = list()

for line in fh:

x=line.split()

for word in x:

if word not in lst:
    lst.append(word)
    lst.sort()

print(lst)