Merge pull request #1400 from anand2312/patch-2

Make `defaultdict` tag

1 files changed, 21 insertions, 0 deletions

diff --git a/bot/resources/tags/defaultdict.md b/bot/resources/tags/defaultdict.md
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+**[`collections.defaultdict`](https://docs.python.org/3/library/collections.html#collections.defaultdict)**
+
+The Python `defaultdict` type behaves almost exactly like a regular Python dictionary, but if you try to access or modify a missing key, the `defaultdict` will automatically insert the key and generate a default value for it.
+While instantiating a `defaultdict`, we pass in a function that tells it how to create a default value for missing keys.
+
+```py
+>>> from collections import defaultdict
+>>> my_dict = defaultdict(int)
+>>> my_dict
+defaultdict(<class 'int'>, {})
+```
+
+In this example, we've used the `int` class which returns 0 when called like a function, so any missing key will get a default value of 0. You can also get an empty list by default with `list` or an empty string with `str`.
+
+```py
+>>> my_dict["foo"]
+0
+>>> my_dict["bar"] += 5
+>>> my_dict
+defaultdict(<class 'int'>, {'foo': 0, 'bar': 5})
+```