docs: fix 'falsey' -> 'falsy' and modernize stale docs.python.org URLs

docs/intro/learning.rst

@@ -18,7 +18,7 @@ This is the official tutorial. It covers all the basics, and offers a tour of
 the language and the standard library. Recommended for those who need a
 quick-start guide to the language.
 
-    `The Python Tutorial <http://docs.python.org/tutorial/index.html>`_
+    `The Python Tutorial <https://docs.python.org/3/tutorial/index.html>`_
 
 Real Python
 ~~~~~~~~~~~
@@ -368,7 +368,7 @@ The Python Language Reference
 This is Python's reference manual. It covers the syntax and the core semantics
 of the language.
 
-    `The Python Language Reference <http://docs.python.org/reference/index.html>`_
+    `The Python Language Reference <https://docs.python.org/3/reference/index.html>`_
 
 Python Essential Reference
 ~~~~~~~~~~~~~~~~~~~~~~~~~~

docs/scenarios/cli.rst

@@ -47,7 +47,7 @@ Plac
 ****
 
 `Plac <https://pypi.org/project/plac>`_ is a simple wrapper
-over the Python standard library `argparse <http://docs.python.org/2/library/argparse.html>`_,
+over the Python standard library `argparse <https://docs.python.org/3/library/argparse.html>`_,
 which hides most of its complexity by using a declarative interface: the
 argument parser is inferred rather than written down imperatively. This
 module targets unsophisticated users, programmers, sysadmins,

docs/writing/structure.rst

@@ -394,7 +394,7 @@ will interfere with the way Python looks for modules.
 
 In the case of `my.spam.py` Python expects to find a :file:`spam.py` file in a
 folder named :file:`my` which is not the case. There is an
-`example <http://docs.python.org/tutorial/modules.html#packages>`_ of how the
+`example <https://docs.python.org/3/tutorial/modules.html#packages>`_ of how the
 dot notation should be used in the Python docs.
 
 If you like, you could name your module :file:`my_spam.py`, but even our trusty

docs/writing/style.rst

@@ -573,7 +573,7 @@ Check if a variable equals a constant
 
 You don't need to explicitly compare a value to True, or None, or 0 -- you can
 just add it to the if statement. See `Truth Value Testing
-<http://docs.python.org/library/stdtypes.html#truth-value-testing>`_ for a
+<https://docs.python.org/3/library/stdtypes.html#truth-value-testing>`_ for a
 list of what is considered false.
 
 **Bad**:
@@ -596,7 +596,7 @@ list of what is considered false.
 
     # or check for the opposite
     if not attr:
-        print('attr is falsey!')
+        print('attr is falsy!')
 
     # or, since None is considered false, explicitly check for it
     if attr is None:
@@ -635,11 +635,11 @@ Short Ways to Manipulate Lists
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 `List comprehensions
-<http://docs.python.org/tutorial/datastructures.html#list-comprehensions>`_
+<https://docs.python.org/3/tutorial/datastructures.html#list-comprehensions>`_
 provides a powerful, concise way to work with lists.
 
 `Generator expressions
-<http://docs.python.org/tutorial/classes.html#generator-expressions>`_
+<https://docs.python.org/3/tutorial/classes.html#generator-expressions>`_
 follows almost the same syntax as list comprehensions but return a generator
 instead of a list.