用一个命令行翻译小工具dict，发现只能翻译英文，不能翻译中文，阅读源代码，发现使用的是urllib2下的urlopen方法去获取有道翻译api的返回结果。
输入中文返回结果显示乱码，然而使用urllib的urlopen方法却能返回正常的结果，于是去查看python源码查找原因。
在urllib中:1
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13def urlopen(url, data=None, proxies=None):
global _urlopener
if proxies is not None:
opener = FancyURLopener(proxies=proxies)
elif not _urlopener:
opener = FancyURLopener()
_urlopener = opener
else:
opener = _urlopener
if data is None:
return opener.open(url)
else:
return opener.open(url, data)
它创建了类 FancyURLopener 对象，并调用了它的 open方法.1
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32def open(self, fullurl, data=None):
fullurl = unwrap(toBytes(fullurl))
fullurl = quote(fullurl, safe="%/:=&?~#+!$,;'@()*[]|")
if self.tempcache and fullurl in self.tempcache:
filename, headers = self.tempcache[fullurl]
fp = open(filename, 'rb')
return addinfourl(fp, headers, fullurl)
urltype, url = splittype(fullurl)
if not urltype:
urltype = 'file'
if urltype in self.proxies:
proxy = self.proxies[urltype]
urltype, proxyhost = splittype(proxy)
host, selector = splithost(proxyhost)
url = (host, fullurl) # Signal special case to open_*()
else:
proxy = None
name = 'open_' + urltype
self.type = urltype
name = name.replace('-', '_')
if not hasattr(self, name):
if proxy:
return self.open_unknown_proxy(proxy, fullurl, data)
else:
return self.open_unknown(fullurl, data)
try:
if data is None:
return getattr(self, name)(url)
else:
return getattr(self, name)(url, data)
except socket.error, msg:
raise IOError, ('socket error', msg), sys.exc_info()[2]
主要是第三行中调用了quote方法，会将字符串url编码，所以有道的api可以解析，而urllib2不会将其转码，这里就不贴代码了。
改写一下，这个小工具就支持中英互译了：dict，使用方法：
1 | dict dick |
1 | dict 鸡巴 |