urllib.error — Exception classes raised by urllib.request¶

Source code: Lib/urllib/error.py

The urllib.error module defines the exception classes for exceptions raised by urllib.request. The base exception class is URLError.

The following exceptions are raised by urllib.error as appropriate:

exception urllib.error.URLError¶

The handlers raise this exception (or derived exceptions) when they run into a problem. It is a subclass of OSError.

reason¶

The reason for this error. It can be a message string or another exception instance.

Changed in version 3.3: URLError used to be a subtype of IOError, which is now an alias of OSError.

Changed in version 3.16: The errno and strerror attributes are now set from reason when it is an OSError. On Windows, winerror is set as well.

exception urllib.error.HTTPError(url, code, msg, hdrs, fp)¶

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.

url¶

Contains the request URL. An alias for filename attribute.

code¶

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 http.server.BaseHTTPRequestHandler.responses.

reason¶

This is usually a string explaining the reason for this error. An alias for msg attribute.

headers¶

The HTTP response headers for the HTTP request that caused the HTTPError. An alias for hdrs attribute.

Added in version 3.4.

fp¶

A file-like object where the HTTP error body can be read from.

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).

content¶

The downloaded (and supposedly truncated) data.