[docs] update redirect links python2 -> python3

docs/topics/downloader-middleware.rst

@@ -739,7 +739,7 @@ HttpProxyMiddleware
    This middleware sets the HTTP proxy to use for requests, by setting the
    ``proxy`` meta value for :class:`~scrapy.http.Request` objects.
 
-   Like the Python standard library modules `urllib`_ and `urllib2`_, it obeys
+   Like the Python standard library module `urllib.request`_, it obeys
    the following environment variables:
 
    * ``http_proxy``
@@ -751,8 +751,7 @@ HttpProxyMiddleware
    Keep in mind this value will take precedence over ``http_proxy``/``https_proxy``
    environment variables, and it will also ignore ``no_proxy`` environment variable.
 
-.. _urllib: https://docs.python.org/2/library/urllib.html
-.. _urllib2: https://docs.python.org/2/library/urllib2.html
+.. _urllib.request: https://docs.python.org/3/library/urllib.request.html
 
 RedirectMiddleware
 ------------------

docs/topics/email.rst

@@ -15,7 +15,7 @@ IO of the crawler. It also provides a simple API for sending attachments and
 it's very easy to configure, with a few :ref:`settings
 <topics-email-settings>`.
 
-.. _smtplib: https://docs.python.org/2/library/smtplib.html
+.. _smtplib: https://docs.python.org/3/library/smtplib.html
 
 Quick example
 =============

docs/topics/exporters.rst

@@ -320,7 +320,7 @@ CsvItemExporter
       Color TV,1200
       DVD player,200
 
-.. _csv.writer: https://docs.python.org/2/library/csv.html#csv.writer
+.. _csv.writer: https://docs.python.org/3/library/csv.html#csv.writer
 
 PickleItemExporter
 ------------------
@@ -342,7 +342,7 @@ PickleItemExporter
 
    Pickle isn't a human readable format, so no output examples are provided.
 
-.. _pickle module documentation: https://docs.python.org/2/library/pickle.html
+.. _pickle module documentation: https://docs.python.org/3/library/pickle.html
 
 PprintItemExporter
 ------------------
@@ -393,7 +393,7 @@ JsonItemExporter
       stream-friendly format, consider using :class:`JsonLinesItemExporter`
       instead, or splitting the output in multiple chunks.
 
-.. _JSONEncoder: https://docs.python.org/2/library/json.html#json.JSONEncoder
+.. _JSONEncoder: https://docs.python.org/3/library/json.html#json.JSONEncoder
 
 JsonLinesItemExporter
 ---------------------
@@ -417,7 +417,7 @@ JsonLinesItemExporter
    Unlike the one produced by :class:`JsonItemExporter`, the format produced by
    this exporter is well suited for serializing large amounts of data.
 
-.. _JSONEncoder: https://docs.python.org/2/library/json.html#json.JSONEncoder
+.. _JSONEncoder: https://docs.python.org/3/library/json.html#json.JSONEncoder
 
 MarshalItemExporter
 -------------------

docs/topics/extensions.rst

@@ -372,5 +372,5 @@ For more info see `Debugging in Python`_.
 
 This extension only works on POSIX-compliant platforms (i.e. not Windows).
 
-.. _Python debugger: https://docs.python.org/2/library/pdb.html
+.. _Python debugger: https://docs.python.org/3/library/pdb.html
 .. _Debugging in Python: https://pythonconquerstheuniverse.wordpress.com/2009/09/10/debugging-in-python/

docs/topics/items.rst

@@ -24,7 +24,7 @@ serialization can be customized using Item fields metadata, :mod:`trackref`
 tracks Item instances to help find memory leaks
 (see :ref:`topics-leaks-trackrefs`), etc.
 
-.. _dictionary-like: https://docs.python.org/2/library/stdtypes.html#dict
+.. _dictionary-like: https://docs.python.org/3/library/stdtypes.html#dict
 
 .. _topics-items-declaring:
 
@@ -249,7 +249,7 @@ Item objects
         :class:`Field` objects used in the :ref:`Item declaration
         <topics-items-declaring>`.
 
-.. _dict API: https://docs.python.org/2/library/stdtypes.html#dict
+.. _dict API: https://docs.python.org/3/library/stdtypes.html#dict
 
 Field objects
 =============
@@ -262,7 +262,7 @@ Field objects
     to support the :ref:`item declaration syntax <topics-items-declaring>`
     based on class attributes.
 
-.. _dict: https://docs.python.org/2/library/stdtypes.html#dict
+.. _dict: https://docs.python.org/3/library/stdtypes.html#dict
 
 
 Other classes related to Item

docs/topics/logging.rst

@@ -83,10 +83,10 @@ path::
 
 .. seealso::
 
-    Module logging, `HowTo <https://docs.python.org/2/howto/logging.html>`_
+    Module logging, `HowTo <https://docs.python.org/3/howto/logging.html>`_
         Basic Logging Tutorial
 
-    Module logging, `Loggers <https://docs.python.org/2/library/logging.html#logger-objects>`_
+    Module logging, `Loggers <https://docs.python.org/3/library/logging.html#logger-objects>`_
         Further documentation on loggers
 
 .. _topics-logging-from-spiders:
@@ -166,13 +166,13 @@ possible levels listed in :ref:`topics-logging-levels`.
 :setting:`LOG_FORMAT` and :setting:`LOG_DATEFORMAT` specify formatting strings
 used as layouts for all messages. Those strings can contain any placeholders
 listed in `logging's logrecord attributes docs
-<https://docs.python.org/2/library/logging.html#logrecord-attributes>`_ and
+<https://docs.python.org/3/library/logging.html#logrecord-attributes>`_ and
 `datetime's strftime and strptime directives
-<https://docs.python.org/2/library/datetime.html#strftime-and-strptime-behavior>`_
+<https://docs.python.org/3/library/datetime.html#strftime-and-strptime-behavior>`_
 respectively.
 
 If :setting:`LOG_SHORT_NAMES` is set, then the logs will not display the Scrapy
-component that prints the log. It is unset by default, hence logs contain the 
+component that prints the log. It is unset by default, hence logs contain the
 Scrapy component responsible for that log output.
 
 Command-line options
@@ -190,7 +190,7 @@ to override some of the Scrapy settings regarding logging.
 
 .. seealso::
 
-    Module `logging.handlers <https://docs.python.org/2/library/logging.handlers.html>`_
+    Module `logging.handlers <https://docs.python.org/3/library/logging.handlers.html>`_
         Further documentation on available handlers
 
 .. _custom-log-formats:
@@ -201,7 +201,7 @@ Custom Log Formats
 A custom log format can be set for different actions by extending
 :class:`~scrapy.logformatter.LogFormatter` class and making
 :setting:`LOG_FORMATTER` point to your new class.
- 
+
 .. autoclass:: scrapy.logformatter.LogFormatter
    :members:
 
@@ -276,6 +276,6 @@ scrapy.utils.log module
     Refer to :ref:`run-from-script` for more details about using Scrapy this
     way.
 
-.. _logging.basicConfig(): https://docs.python.org/2/library/logging.html#logging.basicConfig
+.. _logging.basicConfig(): https://docs.python.org/3/library/logging.html#logging.basicConfig
 
 

docs/topics/request-response.rst

@@ -189,7 +189,7 @@ Request objects
         ``copy()`` or ``replace()`` methods, and can also be accessed, in your
         spider, from the ``response.cb_kwargs`` attribute.
 
-    .. _shallow copied: https://docs.python.org/2/library/copy.html
+    .. _shallow copied: https://docs.python.org/3/library/copy.html
 
     .. method:: Request.copy()
 
@@ -706,7 +706,7 @@ Response objects
 
         A :class:`twisted.internet.ssl.Certificate` object representing
         the server's SSL certificate.
-        
+
         Only populated for ``https`` responses, ``None`` otherwise.
 
     .. method:: Response.copy()
@@ -724,17 +724,17 @@ Response objects
         Constructs an absolute url by combining the Response's :attr:`url` with
         a possible relative url.
 
-        This is a wrapper over `urlparse.urljoin`_, it's merely an alias for
+        This is a wrapper over `urllib.parse.urljoin`_, it's merely an alias for
         making this call::
 
-            urlparse.urljoin(response.url, url)
+            urllib.parse.urljoin(response.url, url)
 
     .. automethod:: Response.follow
 
     .. automethod:: Response.follow_all
 
 
-.. _urlparse.urljoin: https://docs.python.org/2/library/urlparse.html#urlparse.urljoin
+.. _urllib.parse.urljoin: https://docs.python.org/3/library/urllib.parse.html#urllib.parse.urljoin
 
 .. _topics-request-response-ref-response-subclasses:
 

docs/topics/selectors.rst

@@ -36,7 +36,7 @@ defines selectors to associate those styles with specific HTML elements.
 
 .. _BeautifulSoup: https://www.crummy.com/software/BeautifulSoup/
 .. _lxml: https://lxml.de/
-.. _ElementTree: https://docs.python.org/2/library/xml.etree.elementtree.html
+.. _ElementTree: https://docs.python.org/3/library/xml.etree.elementtree.html
 .. _XPath: https://www.w3.org/TR/xpath/all/
 .. _CSS: https://www.w3.org/TR/selectors
 .. _parsel: https://parsel.readthedocs.io/en/latest/

docs/topics/settings.rst

@@ -28,7 +28,7 @@ The value of ``SCRAPY_SETTINGS_MODULE`` should be in Python path syntax, e.g.
 ``myproject.settings``. Note that the settings module should be on the
 Python `import search path`_.
 
-.. _import search path: https://docs.python.org/2/tutorial/modules.html#the-module-search-path
+.. _import search path: https://docs.python.org/3/tutorial/modules.html#the-module-search-path
 
 .. _populating-settings:
 
@@ -902,7 +902,7 @@ Default: ``'%(asctime)s [%(name)s] %(levelname)s: %(message)s'``
 String for formatting log messages. Refer to the `Python logging documentation`_ for the whole list of available
 placeholders.
 
-.. _Python logging documentation: https://docs.python.org/2/library/logging.html#logrecord-attributes
+.. _Python logging documentation: https://docs.python.org/3/library/logging.html#logrecord-attributes
 
 .. setting:: LOG_DATEFORMAT
 
@@ -915,7 +915,7 @@ String for formatting date/time, expansion of the ``%(asctime)s`` placeholder
 in :setting:`LOG_FORMAT`. Refer to the `Python datetime documentation`_ for the whole list of available
 directives.
 
-.. _Python datetime documentation: https://docs.python.org/2/library/datetime.html#strftime-and-strptime-behavior
+.. _Python datetime documentation: https://docs.python.org/3/library/datetime.html#strftime-and-strptime-behavior
 
 .. setting:: LOG_FORMATTER
 

docs/topics/spider-middleware.rst

@@ -173,18 +173,18 @@ object gives you access, for example, to the :ref:`settings <topics-settings>`.
         :type spider: :class:`~scrapy.spiders.Spider` object
 
     .. method:: from_crawler(cls, crawler)
-    
+
        If present, this classmethod is called to create a middleware instance
        from a :class:`~scrapy.crawler.Crawler`. It must return a new instance
        of the middleware. Crawler object provides access to all Scrapy core
        components like settings and signals; it is a way for middleware to
        access them and hook its functionality into Scrapy.
-    
+
        :param crawler: crawler that uses this middleware
        :type crawler: :class:`~scrapy.crawler.Crawler` object
 
 
-.. _Exception: https://docs.python.org/2/library/exceptions.html#exceptions.Exception
+.. _Exception: https://docs.python.org/3/library/exceptions.html#Exception
 
 
 .. _topics-spider-middleware-ref: