更新了更新问题的答案

Question

当我运行以下脚本时

WORD_URL = http://learncodethehardway.org/words.txt
WORDS = []
for word in urlopen(WORD_URL).readline():
    WORDS.append(word.strip())
print WORDS

python提供以下输出：

[＆＃39; a＆＃39;，＆＃39; c＆＃39;，＆＃39; c＆＃39;，＆＃39; o＆＃39;，＆＃39; u＆＃39;，＆＃39; n＆＃39;，＆＃39; t＆＃39;，＆＃39;＆＃39;]

我对strip（）方法如何使用append（）方法感到困惑？另外readline（）如何在这个脚本中起作用？

Answer 1

strip()方法接受您拥有的任何字符串并删除尾随空格和换行符

>>> '   asdfadsf '.strip()
'asdfadsf'

>>> '\nblablabla\n'.strip()
'blablabla'

>>> a = []
>>> a.append('   \n asdf \n    '.strip())
>>> a
['asdf']

>>> words = [' a ', '   b    ', '\nc\n']
>>> words = [word.strip() for word in words]
>>> words
['a', 'b', 'c']

更新了更新问题的答案

from urllib import urlopen

WORD_URL = 'http://learncodethehardway.org/words.txt'
WORDS = []
word_list = urlopen(WORD_URL)
word_list = word_list.readlines()
print word_list                      # before strip()
for word in word_list:
    WORDS.append(word.strip())
print WORDS                          # after strip(), so you get an idea of what strip() does

Answer 2

str.strip方法实际应用于word，这是一个字符串。当strip删除word周围的whilespace字符时，结果字符串会添加到WORDS。

您可以使用List Comprehension（比正常循环更有效），如此

[word.strip() for word in urlopen(WORD_URL).readlines()]

strip（）方法如何与append（）方法一起使用？

2 个答案:

更新了更新问题的答案