Data Aggregation

Group data sequentially utilizing dictionary default values.

You have a list of paired logs:

logs = [("error", 404), ("info", 200), ("error", 500)]

Build a dictionary
```
grouped = {}
```
where keys are the string codes ("error", "info"). The values should be a LIST of the respective numerical codes.
Use
```
.setdefault()
```
inside a loop to guarantee a list exists for each string code before calling
```
.append(num)
```
.
Print
```
grouped
```
.

main.py

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