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Build Flask Web Services

In this lecture we'll learn how to leverage the flask framework to create a web service that serves some RESTful API routes.

In-Class Assignment

Build a web service that implements the following API routes.

GET /api/hello/:name - returns a string: "Hello World <:name>"
GET /api/data - return a dictionary as JSON that has the following contents
```
{
  "temp": [20, 21, 21],
  "time": [10, 20, 30],
  "unit": "s"
}
```
POST /api/add which takes the following JSON data:
```
{
  "a": <some number>,
  "b": <some number>
}
```
Return the sum and status code 200 for a successful calculation. If not successful (b/c of validation) return the proper error status code.