Add future 0.18.2

lib/future/backports/urllib/error.py

@@ -0,0 +1,75 @@
+"""Exception classes raised by urllib.
+
+The base exception class is URLError, which inherits from IOError.  It
+doesn't define any behavior of its own, but is the base class for all
+exceptions defined in this package.
+
+HTTPError is an exception class that is also a valid HTTP response
+instance.  It behaves this way because HTTP protocol errors are valid
+responses, with a status code, headers, and a body.  In some contexts,
+an application may want to handle an exception like a regular
+response.
+"""
+from __future__ import absolute_import, division, unicode_literals
+from future import standard_library
+
+from future.backports.urllib import response as urllib_response
+
+
+__all__ = ['URLError', 'HTTPError', 'ContentTooShortError']
+
+
+# do these error classes make sense?
+# make sure all of the IOError stuff is overridden.  we just want to be
+# subtypes.
+
+class URLError(IOError):
+    # URLError is a sub-type of IOError, but it doesn't share any of
+    # the implementation.  need to override __init__ and __str__.
+    # It sets self.args for compatibility with other EnvironmentError
+    # subclasses, but args doesn't have the typical format with errno in
+    # slot 0 and strerror in slot 1.  This may be better than nothing.
+    def __init__(self, reason, filename=None):
+        self.args = reason,
+        self.reason = reason
+        if filename is not None:
+            self.filename = filename
+
+    def __str__(self):
+        return '<urlopen error %s>' % self.reason
+
+class HTTPError(URLError, urllib_response.addinfourl):
+    """Raised when HTTP error occurs, but also acts like non-error return"""
+    __super_init = urllib_response.addinfourl.__init__
+
+    def __init__(self, url, code, msg, hdrs, fp):
+        self.code = code
+        self.msg = msg
+        self.hdrs = hdrs
+        self.fp = fp
+        self.filename = url
+        # The addinfourl classes depend on fp being a valid file
+        # object.  In some cases, the HTTPError may not have a valid
+        # file object.  If this happens, the simplest workaround is to
+        # not initialize the base classes.
+        if fp is not None:
+            self.__super_init(fp, hdrs, url, code)
+
+    def __str__(self):
+        return 'HTTP Error %s: %s' % (self.code, self.msg)
+
+    # since URLError specifies a .reason attribute, HTTPError should also
+    #  provide this attribute. See issue13211 for discussion.
+    @property
+    def reason(self):
+        return self.msg
+
+    def info(self):
+        return self.hdrs
+
+
+# exception raised when downloaded size does not match content-length
+class ContentTooShortError(URLError):
+    def __init__(self, message, content):
+        URLError.__init__(self, message)
+        self.content = content