Updates books and research

2 files changed, 31 insertions, 0 deletions

diff --git a/research/panc.mdwn b/research/panc.mdwn
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--- a/research/panc.mdwn
+++ b/research/panc.mdwn
@@ -33,6 +33,7 @@
 * Livro do knuppi e do lorenzi
 * Instituto plantarum
 * [Como diferenciar serralha e dente-de-leão](http://www.matosdecomer.com.br/2016/08/como-diferenciar-serralha-e-dente-de.html).
+* [Cartilha Guia Prático de PANC Plantas Alimenticias Nao Convencionais](http://institutokairos.net/wp content/uploads/2017/08/Cartilha Guia Pr%C3%A1tico de PANC Plantas Alimenticias Nao Convencionais.pdf).
 
 ## Pesquisas futuras:
 
diff --git a/research/python.mdwn b/research/python.mdwn
index 72098c2..3a62cad 100644
--- a/research/python.mdwn
+++ b/research/python.mdwn
@@ -44,6 +44,36 @@ Python encourages polymorphism:
     floating points sometimes can, in different ways—by using rational
     representation and by limiting precision
 
+### Types
+
+    More formally, there are three major type (and operation) categories in Python
+    that have this generic nature:
+
+    Numbers (integer, floating-point, decimal, fraction, others)
+    Support addition, multiplication, etc.
+    Sequences (strings, lists, tuples)
+    Support indexing, slicing, concatenation, etc.
+    Mappings (dictionaries)
+    Support indexing by key, etc.
+
+    [...]
+
+    The major core types in Python break down as follows:
+
+    Immutables (numbers, strings, tuples, frozensets)
+    None of the object types in the immutable category support in-place changes,
+    though we can always run expressions to make new objects and assign their
+    results to variables as needed.
+
+    Mutables (lists, dictionaries, sets, bytearray)
+    Conversely, the mutable types can always be changed in place with operations
+    that do not create new objects. Although such objects can be copied, in-place
+    changes support direct modification.
+
 ## Libraries
 
 * [SciPy.org — SciPy.org](https://www.scipy.org/) ([package](https://packages.debian.org/stable/python-scipy)).
+
+## Test projects
+
+* [Arduino Blog » How close are we to doomsday? A clock is calculating it in real time](https://blog.arduino.cc/2013/03/27/how-close-are-we-to-doomsday-clock/) ([python code](https://github.com/tomschofield/Neurotic-Armageddon-Indicator/blob/master/NAI_SERVER/nai_scraper.py) to parse [Timeline from the Bulletin of the Atomic Scientists](http://thebulletin.org/timeline)).