20.8. urllib.error — Exception classes raised by urllib.request
The urllib.error module defines the exception classes for exceptions
raised by urllib.request. The base exception class is URLError,
which inherits from IOError.
The following exceptions are raised by urllib.error as appropriate:
The handlers raise this exception (or derived exceptions) when they run into
a problem. It is a subclass of IOError.
- The reason for this error. It can be a message string or another
exception instance (socket.error for remote URLs, OSError
for local URLs).
Though being an exception (a subclass of URLError), an
HTTPError can also function as a non-exceptional file-like return
value (the same thing that urlopen() returns). This is useful when
handling exotic HTTP errors, such as requests for authentication.
- An HTTP status code as defined in RFC 2616. This numeric value corresponds
to a value found in the dictionary of codes as found in
exception urllib.error.ContentTooShortError(msg, content)
- This exception is raised when the urlretrieve() function detects that
the amount of the downloaded data is less than the expected amount (given by
the Content-Length header). The content attribute stores the
downloaded (and supposedly truncated) data.