Further explained how to initialize sets (#29486)

guide/english/python/learn-about-python-sets/index.md

@@ -1,7 +1,7 @@
 ---
 title: Learn About Python Sets
 ---
-`Set`s in Python are a type of mutable but unordered data structure, which can only contain *unique* elements. 
+`Set`s in Python are a type of mutable but unordered data structure, which can only contain *unique* elements. In other words, it is equivalent to sets in math. 
 
 **Creation:**
 
@@ -31,9 +31,15 @@ However, if elements are included within the curly brackets, then it would be ac
 <class 'set'>
 ````
 
-### Converting List to Set
+## Converting Iterable to Set
+If `set(...)` contains an iterable such as a list, a string, or a tuple as an element, it will return a set containing its' elements. This will remove all duplicate values from the list.
+```python
+>>> example_set_3 = set('some string')
+>>> example_set_3
+{' ', 't', 'g', 'o', 'r', 'i', 's', 'e', 'n', 'm'}
+```
 
-If you want to convert a list to a set, you can do that by using the `set()` function. This will remove all duplicate values from the list.
+If you want to convert an iterable like a list to a set, you can do that by passing it to the `set()` function. 
 ```python
 >>> a = [11,2,2,6,6,4,8,9,9,7]
 >>> a = set(a)