diff --git a/snippets/is_lower_case.md b/snippets/is_lower_case.md
index e760674db..54164c1b3 100644
--- a/snippets/is_lower_case.md
+++ b/snippets/is_lower_case.md
@@ -5,8 +5,8 @@ Checks if a string is lower case.
 Convert the given string to lower case, using `str.lower()` method and compare it to the original.
 
 ```python
-def is_lower_case(str):
-    return str == str.lower()
+def is_lower_case(string):
+    return string == string.lower()
 ```
 
 ```python
diff --git a/snippets/is_upper_case.md b/snippets/is_upper_case.md
index af1f35d55..5aa2a8287 100644
--- a/snippets/is_upper_case.md
+++ b/snippets/is_upper_case.md
@@ -5,8 +5,8 @@ Checks if a string is upper case.
 Convert the given string to upper case, using `str.upper()` method and compare it to the original.
 
 ```python
-def is_upper_case(str):
-    return str == str.upper()
+def is_upper_case(string):
+    return string == string.upper()
 ```
 
 ```python
diff --git a/snippets/max_n.md b/snippets/max_n.md
index 05953faeb..71f4fa094 100644
--- a/snippets/max_n.md
+++ b/snippets/max_n.md
@@ -10,8 +10,7 @@ from copy import deepcopy
 
 def max_n(arr, n=1):
     numbers = deepcopy(arr)
-    numbers.sort()
-    numbers.reverse()
+    numbers.sort(reverse=True)
     return numbers[:n]
 ```