python之list(file) 附加\n到每一行

正在阅读文档(https://docs.python.org/2/tutorial/inputoutput.html):

For reading lines from a file, you can loop over the file object. This is memory efficient, fast, and leads to simple code:

If you want to read all the lines of a file in a list you can also use list(f) or f.readlines().

所以我试了一下:

with open(file) as f: 
    dictionary = sorted(list(f)) 
#debug 
print dictionary 

结果是:

['anuria\n', 'anus\n', 'anuses\n', 'anvil\n', 'anvils\n', 'anxiety\n', 
'anxious\n ', 'any\n', 'anybody\n', 'anyhow\n', 'anymore\n', 
'anyone\n', 'anyplace\n', 'any thing\n', 'anytime\n', 'anyway\n', 
'anywhere\n', 'anywise\n', 'aorta\n', 'aortae \n', 'aortal\n', 
'aortas\n', 'aortic\n', 'aortitis\n', 'aoudad\n', 'aoudads\n', 
'apace\n', 'apache\n', 'apaches\n', 'apanage\n', 'apart\n', 
'apathies\n', 'apathy'...] 

两个问题:

1. 为什么会出现 \n 换行符？

2. 有办法去除吗？或者我必须使用 readline() 并手动追加？

请您参考如下方法:

换行符在那里是因为文件中的每一行都以它结尾。 Python 在读取数据时不会删除此字符。

要删除换行符，您可以使用 generator expression并调用str.rstrip在每一行:

with open(file) as f: 
    dictionary = sorted(line.rstrip() for line in f) 

此外，您的变量命名有些错误； sorted 返回的不是字典而是列表:

>>> sorted(i for i in xrange(10)) 
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9] 
>>>