urllib.parse — 将 URL 剖析成组件
urllib.parse
urllib.error
源代码： Lib/urllib/error.py
The urllib.error module defines the exception classes for exceptions raised by urllib.request . The base exception class is URLError .
urllib.request
URLError
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 OSError .
OSError
The reason for this error. It can be a message string or another exception instance.
3.3 版改变： URLError used to be a subtype of IOError ，现在是别名化的 OSError .
IOError
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.
HTTPError
urlopen()
Contains the request URL. An alias for filename 属性。
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 .
http.server.BaseHTTPRequestHandler.responses
This is usually a string explaining the reason for this error. An alias for msg 属性。
The HTTP response headers for the HTTP request that caused the HTTPError . An alias for hdrs 属性。
Added in version 3.4.
A file-like object where the HTTP error body can be read from.
此异常被引发当 urlretrieve() function detects that the amount of the downloaded data is less than the expected amount (given by the Content-Length 头)。
urlretrieve()
The downloaded (and supposedly truncated) data.
urllib.robotparser — robots.txt 剖析器
urllib.robotparser
键入搜索术语或模块、类、函数名称。