Update some snippets

snippets/is_anagram.md

@@ -1,20 +1,22 @@
 ---
 title: is_anagram
-tags: string
+tags: string,intermediate
 ---
-Determine if 2 strings are anagrams.
 
-Returns true if 2 strings are anagrams of each other, false otherwise.
-Capital letters and whitespaces are ignored.
+Checks if a string is an anagram of another string (case-insensitive, ignores spaces, punctuation and special characters).
+
+Use `str.replace()` to remove spaces from both strings.
+Compare the lengths of the two strings, return `False` if they are not equal.
+Use `sorted()` on both strings and compare the results.
 
 ```py
 def is_anagram(str1, str2):
-    str1, str2 = str1.replace(" ", ""), str2.replace(" ", "")
+  _str1, _str2 = str1.replace(" ", ""), str2.replace(" ", "")
 
-    if len(str1) != len(str2):
-        return False
-    else:
-        return sorted(str1.lower()) == sorted(str2.lower())
+  if len(_str1) != len(_str2):
+    return False
+  else:
+    return sorted(_str1.lower()) == sorted(_str2.lower())
 ```
 
 ```py

snippets/is_lower_case.md

@@ -1,14 +1,15 @@
 ---
 title: is_lower_case
-tags: string
+tags: string,utility,beginner
 ---
+
 Checks if a string is lower case.
 
-Convert the given string to lower case, using `str.lower()` method and compare it to the original.
+Convert the given string to lower case, using `str.lower()` and compare it to the original.
 
 ```py
 def is_lower_case(string):
-    return string == string.lower()
+  return string == string.lower()
 ```
 
 ```py

snippets/is_upper_case.md

@@ -1,14 +1,15 @@
 ---
 title: is_upper_case
-tags: string
+tags: string,utility,beginner
 ---
+
 Checks if a string is upper case.
 
-Convert the given string to upper case, using `str.upper()` method and compare it to the original.
+Convert the given string to upper case, using `str.upper()` and compare it to the original.
 
 ```py
 def is_upper_case(string):
-    return string == string.upper()
+  return string == string.upper()
 ```
 
 ```py

snippets/keys_only.md

@@ -1,21 +1,23 @@
 ---
 title: keys_only
-tags: object
+tags: object,list,beginner
 ---
-Function which accepts a dictionary of key value pairs and returns a new flat list of only the keys.
 
-Uses the .keys() method of "dict" objects. dict.keys() returns a view object that displays a list of all the keys. Then, list(dict.keys()) returns a list that stores all the keys of a dict.
+Returns a flat list of all the keys in a flat dictionary.
+
+Use `dict.keys()` to return the keys in the given dictionary.
+Return a `list()` of the previous result.
 
 ```py
 def keys_only(flat_dict):
-    return list(flat_dict.keys())
+  return list(flat_dict.keys())
 ```
 
 ```py
 ages = {
-     "Peter": 10,
-     "Isabel": 11,
-     "Anna": 9,
+  "Peter": 10,
+  "Isabel": 11,
+  "Anna": 9,
 }
 keys_only(ages) # ['Peter', 'Isabel', 'Anna']
 ```