Delete python/plurals.py

Improved formatting.

python/1_0_Intro_Python.ipynb

@@ -74,7 +74,6 @@
     "* [The Python tutorial](https://docs.python.org/3/tutorial/)\n",
     "* [Object-Oriented Programming in Python](http://python-textbok.readthedocs.org/en/latest/index.html)\n",
     "* [Python3 tutorial](http://www.python-course.eu/python3_course.php)\n",
-    "* [Python for the Busy Java Developer, Deepak Sarda, 2014](http://antrix.net/static/pages/python-for-java/online/)\n",
     "* [Style Guide for Python Code (PEP-0008)](https://www.python.org/dev/peps/pep-0008/)\n",
     "* [Python Slides](http://tdc-www.harvard.edu/Python.pdf)\n",
     "* [Python for Programmers - 1 day course](http://www.ucs.cam.ac.uk/docs/course-notes/unix-courses/archived/archived-python-courses/PythonProgIntro/files/notes.pdf)\n",

python/1_2_Numbers_Strings.ipynb

@@ -85,7 +85,7 @@
     "In Python3, there are the following [numeric types](https://docs.python.org/3/library/stdtypes.html#typesnumeric):\n",
     "* integers (int): 1, -1, ...\n",
     "* floating point numbers (float): 0.1, 1E2\n",
-    "* complex numbers (complex): 2 + 3j\n",
+    "* complex numbers (complex): 2 + 3j\n.",
     "Let's play a bit"
    ]
   },

python/1_3_Sequences.ipynb

@@ -377,7 +377,7 @@
     "\n",
     "Tuples are faster than lists. Its main usage is when the collection is constant, or you do not want it can be changed (write protected). \n",
     "\n",
-    "Tuples can be converted into lists and vice-versa, with the methods list() and tuple()."
+    "Tuples can be converted into lists and vice-versa, with the methods *list()* and *tuple()*."
    ]
   },
   {

python/1_4_Sets.ipynb

@@ -37,7 +37,7 @@
     "\n",
     "A set object is an unordered collection of distinct objects. There are two built-in set types: **set** (mutable) and **frozenset** (inmutable).\n",
     "\n",
-    "A mapping object maps hashable values to arbitrary objects. Mappings are mutable objects. There is only one bultin mapping type: **dictionary**."
+    "A mapping object maps hashable values to arbitrary objects. Mappings are mutable objects. There is only one builtin mapping type: **dictionary**."
    ]
   },
   {

python/1_8_Classes.ipynb

@@ -41,7 +41,7 @@
     "The first argument of instance class method is self, that refers to the current instance of the class.\n",
     "There is a special method, __init__ that initializes the object. It is like a constructor, but the object is already created when __init__ is called.\n",
     "\n",
-    "Instance attributes are define as self.variables. (self is the same than this in Java)."
+    "Instance attributes are define as *self.variables*. (self is the same than this in Java)."
    ]
   },
   {