new snippets

snippets/is_upper_case.md

@@ -0,0 +1,16 @@
+### is_upper_case
+
+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()
+```
+
+```python
+is_upper_case('ABC') # True
+is_upper_case('a3@$') # True
+is_upper_case('aB4') # False
+```