21.9. urllib.error — 由 urllib.request 引发的异常类 ¶

源代码： Lib/urllib/error.py

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.

3.3 版改变： URLError has been made a subclass of OSError 而不是 IOError .

exception urllib.error. HTTPError ¶

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.

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.

headers ¶

The HTTP response headers for the HTTP request that caused the HTTPError .

3.4 版新增。

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.

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