在python openurl方法中的read().decode('utf-8')之后，HttpResponseObject会改变吗？

Question

我目前正在学习python 3，在玩openurl时，我注意到在read((.decode('utf-8'(之后，我的HTTP响应对象的长度变为零，我不明白它为什么会这样。

story = urlopen('http://sixty-north.com/c/t.txt')
print(story.read().decode('utf-8'))
story_words = []
for line in story:
line_words = line.decode('utf-8').split()
for word in line_words:
story_words.append(word)
story.close()
print(story_words)

在第2行执行打印命令时，故事中HTTP响应的长度从593变为0，并且在故事词上打印一个空数组。如果删除print命令，则会填充story_words数组。

Output with read().decode()
It was the best of times
it was the worst of times
it was the age of wisdom
it was the age of foolishness
it was the epoch of belief
it was the epoch of incredulity
it was the season of Light
it was the season of Darkness
it was the spring of hope
it was the winter of despair
we had everything before us
we had nothing before us
we were all going direct to Heaven
we were all going direct the other way
in short the period was so far like the present period that some of
its noisiest authorities insisted on its being received for good or for
evil in the superlative degree of comparison only
[]
Output without it - 
['It', 'was', 'the', 'best', 'of', 'times', 'it', 'was', 'the', 'worst', 'of', 'times', 'it', 'was', 'the', 'age', 'of', 'wisdom', 'it', 'was', 'the', 'age', 'of', 'foolishness', 'it', 'was', 'the', 'epoch', 'of', 'belief', 'it', 'was', 'the', 'epoch', 'of', 'incredulity', 'it', 'was', 'the', 'season', 'of', 'Light', 'it', 'was', 'the', 'season', 'of', 'Darkness', 'it', 'was', 'the', 'spring', 'of', 'hope', 'it', 'was', 'the', 'winter', 'of', 'despair', 'we', 'had', 'everything', 'before', 'us', 'we', 'had', 'nothing', 'before', 'us', 'we', 'were', 'all', 'going', 'direct', 'to', 'Heaven', 'we', 'were', 'all', 'going', 'direct', 'the', 'other', 'way', 'in', 'short', 'the', 'period', 'was', 'so', 'far', 'like', 'the', 'present', 'period', 'that', 'some', 'of', 'its', 'noisiest', 'authorities', 'insisted', 'on', 'its', 'being', 'received', 'for', 'good', 'or', 'for', 'evil', 'in', 'the', 'superlative', 'degree', 'of', 'comparison', 'only']

Answer 1

调用urlopen会返回一个类似文件的缓冲区对象。使用read，您可以获得最多几个字节的响应，或者在不传递参数时获得整个响应，直到EOF。读取后，缓冲区为空。这意味着您需要在打印之前将返回的值保存在变量中。