docs: abstract base classes and container abstract base classes

Author: praisetompane

…ary/29_python_runtime_services/0_def.txt …e_services/0_python_runtime_services.txt2_standard_library/29_python_runtime_services/0_def.txt renamed to 2_standard_library/29_python_runtime_services/0_python_runtime_services.txt 2_standard_library/29_python_runtime_services/0_def.txt renamed to 2_standard_library/29_python_runtime_services/0_python_runtime_services.txt

@@ -15,4 +15,5 @@ def python_runtime_services:
 
     - proof: ???
 
-References: ???
+References:
+    The Python Standard Library. Python Runtime Services. 2025. https://docs.python.org/3/library/python.html

2_standard_library/29_python_runtime_services/9_abcs.txt

@@ -0,0 +1,23 @@
+def abcs:
+    - formal: ???
+
+        - in words: ???
+
+    - plain english: ???
+
+    - intuition: ???
+
+    - properties:
+        - specification: 
+            - https://peps.python.org/pep-3119/
+            - https://docs.python.org/3/library/abc.html#module-abc
+        - implementation: https://github.com/python/cpython/blob/3.13/Lib/abc.py
+
+    - examples: ???
+
+    - use cases: ???
+        
+    - proof: ???
+    
+References:
+    The Python Standard Library. Python Runtime Services. 2025. https://docs.python.org/3/library/python.html

2_standard_library/4_built_in_types/5_iterator_types/1_iterator.txt

@@ -26,5 +26,5 @@ def iterator:
   - proof: None. It is a definition.
 
 References:
-  https://docs.python.org/3.11/glossary.html#term-iterator
+  The Python Standard Library. 2025. https://docs.python.org/3/glossary.html#term-iterator
 

2_standard_library/4_built_in_types/5_iterator_types/2_generator.txt

@@ -21,6 +21,6 @@ def generator | generator function:
   - proof: None. It is a definition.
 
 References:
-  https://docs.python.org/3.11/glossary.html#term-generator
+  The Python Standard Library. 2025. https://docs.python.org/3/glossary.html#term-generator
 
 

2_standard_library/4_built_in_types/5_iterator_types/3_generator_expression.txt

@@ -19,5 +19,5 @@
   - proof: None. It is a definition.
 
 References:
-  https://docs.python.org/3.11/glossary.html#term-generator-iterator
+  The Python Standard Library. 2025. https://docs.python.org/3/glossary.html#term-generator-iterator
 

2_standard_library/8_data_types/5_collections_abstract_base_classes/0_collections_abcs.txt

@@ -0,0 +1,27 @@
+def collections_abcs:
+    - formal: ???
+
+        - in words: ???
+
+    - plain english: ???
+
+    - intuition: ???
+
+    - properties:
+        - implementation: https://github.com/python/cpython/tree/3.11/Lib/_collections_abc.py
+        - specification: https://docs.python.org/3/library/collections.abc.html
+    - examples: 
+        - test interface compliance:
+            - hashable
+            - iterable
+            - mapping
+            - ...
+
+    - use cases:
+        - implement custom classes that satisfy the container API.
+        - test compliance to a collections' interface using `issubclass` or `isinstance`.
+        
+    - proof: ???
+    
+References: 
+    The Python Standard Library. 2025. collections.abc — Abstract Base Classes for Containers, Data Types. https://docs.python.org/3/library/collections.abc.html