Merge pull request #158 from kakasahebKK:kw-dictionary-changes

added dictionary subscripting

Author: wilfredinni

.vscode/settings.json

@@ -153,6 +153,7 @@
         "timedelta",
         "timeit",
         "udiskie",
+        "Traceback",
         "unhashable",
         "useb",
         "vendorizing",

docs/cheatsheet/dictionaries.md

@@ -28,6 +28,38 @@ my_cat = {
 }
 ```
 
+## Set key, value using subscript operator `[]`
+```python
+>>> my_cat = {
+...  'size': 'fat',
+...  'color': 'gray',
+...  'disposition': 'loud',
+... }
+>>> my_cat['age_years'] = 2
+>>> print(my_cat)
+...
+# {'size': 'fat', 'color': 'gray', 'disposition': 'loud', 'age_years': 2}
+```
+
+## Get value using subscript operator `[]`
+
+In case the key is not present in dictionary <a target="_blank" href="https://docs.python.org/3/library/exceptions.html#KeyError">`KeyError`</a> is raised.
+
+```python
+>>> my_cat = {
+...  'size': 'fat',
+...  'color': 'gray',
+...  'disposition': 'loud',
+... }
+>>> print(my_cat['size'])
+...
+# fat
+>>> print(my_cat['eye_color'])
+# Traceback (most recent call last):
+#   File "<stdin>", line 1, in <module>
+# KeyError: 'eye_color'
+```
+
 ## values()
 
 The `values()` method gets the **values** of the dictionary: