IndentationError：预计在while循环的缩进块

Question

我有，当我从多个网站

import urllib 
urls = ["http://google.com","http://cnn.com"] 

i=0 
n=len(urls) 

while i< n: 
htmlfile = urllib.urlopen(urls[i]) 
htmltext =htmlfile.read() 
print htmltext 
i=i+1 

错误尝试网络刮此错误：

PS C:\python> python basic1.py 
    File "basic1.py", line 9 
    htmlfile = urllib.urlopen(urls[i]) 
    IndentationError: expected an indented block 

Answer 1

import urllib 

urls = ["http://google.com","http://cnn.com"] 

i=0 
n=len(urls) 

while i < n: 
    htmlfile = urllib.urlopen(urls[i]) 
    htmltext =htmlfile.read() 
    print htmltext 
    i=i+1 

Answer 2

你得到那个错误是因为你没有缩进。 Python需要严格缩进作为代码块分隔符。试试这个：

i=0 
n=len(urls) 

while i< n: 
    htmlfile = urllib.urlopen(urls[i]) 
    htmltext =htmlfile.read() 
    print htmltext 
    i=i+1 

Answer 3

您已经缩进错误，这意味着，你的一些子块需要有像之前的4spaces，这是你的，而代码块清楚，这是正确的做法：

import urllib 
urls = ["http://google.com","http://cnn.com"] 

i=0 
n=len(urls) 

while i< n: 
    htmlfile = urllib.urlopen(urls[i]) 
    htmltext =htmlfile.read() 
    print htmltext 
    i=i+1