List split、rstrip、append-in列表的使用

这周的作业是关于列表的问题，我无法摆脱列表符号

打开文件romeo.txt并逐行读取。对于每一行，使用split（）方法将该行拆分为一个单词列表。程序应该建立一个单词列表。对于每行中的每个单词，检查该单词是否已经在列表中，如果没有，则将其附加到列表中。程序完成后，按字母顺序对生成的单词进行排序和打印

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如注释中所述，设置一个

set

会更好，但由于作业是关于列表的，请尝试以下操作：

list_of_words = []
with open('romeo.txt') as f:
    for line in f:
        words = line.split()
        for word in words:
            if word not in list_of_words:
                list_of_words.append(word)

sorted_list_of_words = sorted(list_of_words)
print(' '.join(sorted_list_of_words))

输出：

Arise But It Juliet Who already and breaks east envious fair grief is kill light moon pale sick soft sun the through what window with yonder

fname = raw_input('Enter file: ')

wordlist = list()
for line in open(fname, 'r'):
    words = line.split()
    for word in words:
        if word in wordlist: continue
        wordlist.append(word)

wordlist.sort()
print ' '.join(wordlist)

向用户请求文件名的替代解决方案，使用continue并与python 2.x兼容：

Arise But It Juliet Who already and breaks east envious fair grief is kill light moon pale sick soft sun the through what window with yonder

fname = raw_input('Enter file: ')

wordlist = list()
for line in open(fname, 'r'):
    words = line.split()
    for word in words:
        if word in wordlist: continue
        wordlist.append(word)

wordlist.sort()
print ' '.join(wordlist)

输出：

Enter file: romeo.txt
Arise But It Juliet Who already and breaks east envious fair grief is kill light moon pale sick soft sun the through what window with yonder

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通过使用联接“”除去[]。联接（lst）。此外，如果要检查重复项，最好使用集合而不是列表。