Python 下载网页的几种方法
总结下，Python 下载网页的几种方法
1
fd = urllib2.urlopen(url_link)
data = fd.read()
这是最简洁的一种，当然也是Get的方法
2
通过GET的方法
def GetHtmlSource(url):
try:
htmSource = ''
req = urllib2.Request(url)
fd = urllib2.urlopen(req,"")
while 1:
data = fd.read(1024)
if not len(data):
break
htmSource += data
fd.close()
del fd
del req
htmSource = htmSource.decode('cp936')
htmSource = formatStr(htmSource)
return htmSource
except socket.error, err:
str_err = "%s" % err
return ""
3
通过GET的方法
def GetHtmlSource_Get(htmurl):
htmSource = ""
try:
相关文档：
Python内建异常体系结构
BaseException
+-- SystemExit
+-- KeyboardInterrupt
+-- GeneratorExit
+-- Exception
+-- StopIteration
+-- StandardError
| +-- BufferError
| +-- ArithmeticError
| | +-- FloatingPointError
| | +-- OverflowError
| ......
代码+结果，不做解释
当然，对于python没有virtual function一说，估计当作对比一个例子看看吧。
#include <iostream>
using namespace std;
class base
{
public:
virtual void foo() { cout << "base" << endl; }
base() { foo() ;}
};
class derive: public base
{
pub ......
There should be one—--and preferably only one –--obvious way to do it.
......
