Imports, Iterable duck types

Author: gto76

README.md

@@ -823,7 +823,7 @@ import <module>            # Imports a built-in or '<module>.py'.
 import <package>           # Imports a built-in or '<package>/__init__.py'.
 import <package>.<module>  # Imports a built-in or '<package>/<module>.py'.
 ```
-* **Package is a collection of modules, but it can also define its own objects, classes, etc.**
+* **Package is a collection of modules, but it can also define its own functions, classes, etc.**
 * **On a filesystem this corresponds to a directory of Python files with an optional init script.**
 * **Running `'import <package>'` does not automatically provide access to the package's modules unless they are explicitly imported in the `'<package>/__init__.py'` script.**
 * **Directory of the file that is passed to python command serves as a root of local imports.**
@@ -1262,7 +1262,7 @@ class MyCollection:
 ```
 
 ### Sequence
-* **Only required methods are getitem() and len(). Getitem() should return the item at the passed index or raise IndexError (this excludes dictionaries because they accept keys).**
+* **Only required methods are getitem() and len(). Getitem() should return the item at the passed index or raise IndexError (it may also support negative indices and/or slices).**
 * **Iter() and contains() automatically work on any object that has getitem() defined.**
 * **Reversed() automatically works on any object that has getitem() and len() defined. It returns reversed iterator of object's items.**
 ```python

index.html

@@ -704,7 +704,7 @@
 
 
 <ul>
-<li><strong>Package is a collection of modules, but it can also define its own objects, classes, etc.</strong></li>
+<li><strong>Package is a collection of modules, but it can also define its own functions, classes, etc.</strong></li>
 <li><strong>On a filesystem this corresponds to a directory of Python files with an optional init script.</strong></li>
 <li><strong>Running <code class="python hljs"><span class="hljs-string">'import &lt;package&gt;'</span></code> does not automatically provide access to the package's modules unless they are explicitly imported in the <code class="python hljs"><span class="hljs-string">'&lt;package&gt;/__init__.py'</span></code> script.</strong></li>
 <li><strong>Directory of the file that is passed to python command serves as a root of local imports.</strong></li>
@@ -1085,7 +1085,7 @@
 
 
 <div><h3 id="sequence">Sequence</h3><ul>
-<li><strong>Only required methods are getitem() and len(). Getitem() should return the item at the passed index or raise IndexError (this excludes dictionaries because they accept keys).</strong></li>
+<li><strong>Only required methods are getitem() and len(). Getitem() should return the item at the passed index or raise IndexError (it may also support negative indices and/or slices).</strong></li>
 <li><strong>Iter() and contains() automatically work on any object that has getitem() defined.</strong></li>
 <li><strong>Reversed() automatically works on any object that has getitem() and len() defined. It returns reversed iterator of object's items.</strong></li>
 </ul><pre><code class="python language-python hljs"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">MySequence</span>:</span>