如何读取文本文件并以相反的顺序输出单词?Python

所以我正在编写一个代码来读取文本并在屏幕上以相反的顺序输出单词,这意味着原始文本是

hello world
how are you

至:

you are how
world hello

我让它部分工作,问题是它在一个列中输出它,但我希望它在行中.

代码是

for a in reversed(list(open("text.txt"))):
    for i in a:
        a = i.split()
        b =  a[::-1]
        final_string = ''
        for i in b:
            final_string += i + ' '
        print(final_string)

最佳答案 你有一个循环太多:

for a in reversed(list(open("text.txt"))):
    for i in a:

第一个循环以相反的顺序生成文件中的行,因此a绑定到每一行.然后第二个循环遍历该行中的每个单独字符.然后,您继续“反转”该字符(或当该字符是空格或换行符时为空列表).

你已经在文件中使用了反转,你也可以用它作为行;将它与str.join()结合:

for line in reversed(list(open("text.txt"))):
    words = line.split()
    reversed_words = ' '.join(reversed(words))
    print(reversed_words)

或者更简洁地说:

print(*(' '.join(l.split()[::-1]) for l in reversed(list(open('text.txt')))), sep='\n')

演示:

>>> with open('text.txt', 'w') as fo:
...     fo.write('''\
... hello world
... how are you
... ''')
... 
24
>>> for line in reversed(list(open("text.txt"))):
...     words = line.split()
...     reversed_words = ' '.join(reversed(words))
...     print(reversed_words)
... 
you are how
world hello
>>> print(*(' '.join(l.split()[::-1]) for l in reversed(list(open('text.txt')))), sep='\n')
you are how
world hello
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