Update some snippets

snippets/all_unique.md

@@ -9,7 +9,7 @@ Use `set()` on the given list to remove duplicates, compare its length with the
 
 ```py
 def all_unique(lst):
-    return len(lst) == len(set(lst))
+  return len(lst) == len(set(lst))
 ```
 
 ```py

snippets/average.md

@@ -1,16 +1,15 @@
 ---
 title: average
-tags: math
+tags: math,list,beginner
 ---
-:information_source: Already implemented via `statistics.mean`. `statistics.mean` takes an array as an argument whereas this function takes variadic arguments.
 
 Returns the average of two or more numbers.
 
-Takes the sum of all the `args` and divides it by `len(args)`. The second argument `0.0` in sum is to handle floating point division in `python3`.
+Use `sum()` to sum all of the `args` provided, divide by `len(args)`.
 
 ```py
 def average(*args):
-    return sum(args, 0.0) / len(args)
+  return sum(args, 0.0) / len(args)
 ```
 
 ```py

snippets/bubble_sort.md

@@ -1,21 +0,0 @@
----
-title: bubble_sort
-tags: list
----
-
-Bubble_sort uses the technique of comparing and swapping
-
-```py
-def bubble_sort(lst):
-    for passnum in range(len(lst) - 1, 0, -1):
-        for i in range(passnum):
-            if lst[i] > lst[i + 1]:
-                lst[i], lst[i + 1] = lst[i + 1], lst[i]
-
-```
-
-```py
-lst = [54,26,93,17,77,31,44,55,20]
-bubble_sort(lst)
-print("sorted %s" %lst) # [17,20,26,31,44,54,55,77,91]
-```

snippets/byte_size.md

@@ -1,14 +1,15 @@
 ---
 title: byte_size
-tags: string
+tags: string, beginner
 ---
+
 Returns the length of a string in bytes.
 
-`utf-8` encodes a given string, then `len` finds the length of the encoded string.
+Use `string.encode('utf-8')` to encode the given string and return its length.
 
 ```py
 def byte_size(string):
-    return(len(string.encode('utf-8')))
+  return len(string.encode('utf-8'))
 ```
 
 ```py