Merge pull request #511 from jarrodmillman/python2

Remove Python 2 material

Author: pdebuyl

intro/index.rst

@@ -18,7 +18,6 @@ itself, to numerical computing or plotting.
 
    intro.rst
    language/python_language.rst
-   python_2_python_3.rst
    numpy/index.rst 
    matplotlib/index.rst 
    scipy.rst

intro/intro.rst

@@ -248,15 +248,6 @@ Python comes in many flavors, and there are many ways to install it.
 However, we recommend to install a scientific-computing distribution,
 that comes readily with optimized versions of scientific modules.
 
-.. warning:: **You should install Python 3**
-
-  Python 2.7 is end of life, and will not be maintained past January 1, 2020.
-
-  **Working with Python 2.7 is at your own risk. Do not expect much support.**
-
-  * `Official announcement <https://www.python.org/dev/peps/pep-0373/>`_
-  * `The end is nigh <https://pythonclock.org/>`_
-
 **Under Linux**
 
 If you have a recent distribution, most of the tools are probably

intro/language/basic_types.rst

@@ -62,47 +62,6 @@ Type conversion (casting)::
     >>> float(1)
     1.0
 
-.. warning:: Integer division
-
-    In Python 2::
-
-        >>> 3 / 2   # doctest: +SKIP
-        1
-
-    In Python 3::
-
-        >>> 3 / 2   # doctest: +SKIP
-        1.5
-
-    **To be safe**: use floats::
-
-        >>> 3 / 2.
-        1.5
-
-        >>> a = 3
-        >>> b = 2
-        >>> a / b # In Python 2  # doctest: +SKIP
-        1
-        >>> a / float(b)
-        1.5
-
-    **Future behavior**: to always get the behavior of Python3
-
-        >>> from __future__ import division  # doctest: +SKIP
-        >>> 3 / 2  # doctest: +SKIP
-        1.5
-
-    .. tip::
-
-      If you explicitly want integer division use ``//``::
-
-        >>> 3.0 // 2
-        1.0
-
-      .. note::
-
-        The behaviour of the division operator has changed in `Python 3
-        <http://python3porting.com/preparing.html#use-instead-of-when-dividing-integers>`_.
 
 Containers
 ------------

intro/numpy/elaborate_arrays.rst

@@ -84,15 +84,6 @@ Unsigned integers:
     >>> np.iinfo(np.uint32).max, 2**32 - 1
     (4294967295, 4294967295)
 
-.. sidebar:: Long integers
-
-    Python 2 has a specific type for 'long' integers, that cannot
-    overflow, represented with an 'L' at the end. In Python 3, all
-    integers are long, and thus cannot overflow.
-
-     >>> np.iinfo(np.int64).max, 2**63 - 1  # doctest: +SKIP
-     (9223372036854775807, 9223372036854775807L)
-
 
 Floating-point numbers: