Coding Challenge
There are 2 main files: housing_server.py and housing_data.py.
On startup, we load data from housing_data.py (more on that below). It's setup as a gRPC server, taking in EstimatePriceRequests and returning EstimatePriceResponses.
On initialization, the CSV is downloaded if missing and loaded into memory into a dictionary of dictionaries like below:
{
'borough1': {
date(2000, 1, 1): Decimal('29.0'),
date(2000, 2, 1): Decimal('30.0'),
...
},
'borough2': {
date(2000, 1, 1): Decimal('9.012'),
date(2000, 2, 1): Decimal('12.2'),
...
},
...
}
While using up more memory and time in the beginning, this allows constant time lookups and very low latency.
virtualenv venv
source venv/bin/activate
pip install -r requirements_lock.txt
Start the server: python housing_server.py
Run the example client: python housing_client_example.py
Modify the requirements.txtfile to add or update new deps.
After modifying, run:
pip install -r requirements.txt --upgrade && pip freeze > requirements_lock.txt
That will save everything into the requirements.txt file but won't be very
user-readable. Think of this as the difference between Gemfile and Gemfile.lock
for anyone with Ruby experience.