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POwhy can't i __init__ my custom FancyURLopener with the user & passwd
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  1. POwhy can't i __init__ my custom FancyURLopener with the user & passwd
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    copied!<p>I'm unable to write a custom urllib.FancyURLopener which initializes the user and passwd values in the constructor. I can get it to work fine with an empty constructor and a subsequent call to setpasswd. When I try to set the user and password in the constructor, I get strange errors regarding a missing attribute 'tempcache'. Am I missing some Python syntax/usage regarding <strong>init</strong>?</p> <p>I want to be able to specify my user and passwd in the constructor like so:</p> <pre><code>opener = MyRouterOpener("", "secretPassword") page = opener.open("http://192.168.1.1/Status_Router.asp") #do something with the page </code></pre> <p>Trying this way fails:</p> <pre><code>import urllib class MyRouterOpener(urllib.FancyURLopener): def __init__(self, user, passwd): self.setpasswd(user, passwd) def setpasswd(self, user, passwd): self.__user = user self.__passwd = passwd def prompt_user_passwd(self, host, realm): return self.__user, self.__passwd opener = MyRouterOpener("", "secretPassword") statusPage = opener.open("http://192.168.1.1/Status_Router.asp") </code></pre> <p>Output:</p> <pre><code>Traceback (most recent call last): File "W:\Desktop\DynDns.enom.bad.py", line 15, in &lt;module&gt; statusPage = opener.open("http://192.168.1.1/Status_Router.asp") File "C:\Users\pengt\Python26\lib\urllib.py", line 179, in open if self.tempcache and fullurl in self.tempcache: AttributeError: RouterOpener instance has no attribute 'tempcache' Exception AttributeError: "RouterOpener instance has no attribute 'tempcache'" in &lt;bound method RouterOpener.__del__ of &lt;__main__.RouterOpener instance at 0x022AB9E0&gt;&gt; ignored </code></pre> <p>I've also tried:</p> <pre><code>import urllib class RouterOpener(urllib.FancyURLopener): def __init__(self, user, passwd): self.__user = user self.__passwd = passwd def prompt_user_passwd(self, host, realm): return self.__user, self.__passwd opener = RouterOpener("", "secretPassword") statusPage = opener.open("http://192.168.1.1/Status_Router.asp") </code></pre> <p>But this produces:</p> <pre><code>Traceback (most recent call last): File "W:\Desktop\DynDns.enom.bad.py", line 12, in &lt;module&gt; statusPage = opener.open("http://192.168.1.1/Status_Router.asp") File "C:\Users\pengt\Python26\lib\urllib.py", line 179, in open if self.tempcache and fullurl in self.tempcache: AttributeError: RouterOpener instance has no attribute 'tempcache' Exception AttributeError: "RouterOpener instance has no attribute 'tempcache'" in &lt;bound method RouterOpener.__del__ of &lt;__main__.RouterOpener instance at 0x0231B968&gt;&gt; ignored </code></pre> <p>The only thing I've been able to get work is:</p> <pre><code>import urllib class MyRouterOpener(urllib.FancyURLopener): def setpasswd(self, user, passwd): self.__user = user self.__passwd = passwd def prompt_user_passwd(self, host, realm): return self.__user, self.__passwd opener = MyRouterOpener() opener.setpasswd("", "secretPassword") statusPage = opener.open("http://192.168.1.1/Status_Router.asp") </code></pre> <p>But then I'm specifying my user and passwd on a separate line. I know this is no big deal really, but like I say above I'm really wanting to know if I'm missing something about Python regarding inheritance and <strong>init</strong> etc.</p>
 

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