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app.py
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app.py
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import numpy as np
import sqlalchemy
from sqlalchemy.ext.automap import automap_base
from sqlalchemy.orm import Session
from sqlalchemy import create_engine, func, MetaData, within_group
from sqlalchemy.pool import StaticPool
from flask import Flask, jsonify
import datetime as dt
#################################################
# Database Setup
#################################################
engine = create_engine("sqlite:///Resources/hawaii.sqlite",
connect_args={'check_same_thread':False},
poolclass=StaticPool)
# reflect an existing database into a new model
Base = automap_base()
# reflect the tables
Base.prepare(engine, reflect=True)
# Save reference to the table
Measurement = Base.classes.measurement
Station = Base.classes.station
# Create our connection object
session = Session(engine)
#################################################
# Flask Setup
#################################################
app = Flask(__name__)
#################################################
# Flask Routes
#################################################
@app.route("/")
def welcome():
"""List all available api routes"""
return (
"Available Routes:<br/><br/>" +
"<table border=0>" +
"<tr><td>Precipitation values per station per date:</td><td><a href=""/api/v1.0/precipitation"">/api/v1.0/precipitation</a></td></tr>"+
"<tr><td>Stations with counts of measurements recorded:</td><td><a href=""/api/v1.0/stations"">/api/v1.0/stations</a></td></tr>"+
"<tr><td>Temperature observations over the past year:</td><td><a href=""/api/v1.0/tobs"">/api/v1.0/tobs</a></td></tr>"+
"<tr><td>Temperature results (min, avg, max) since provided date (yyyymmdd):</td><td>/api/v1.0/<start></td></tr>"+
"<tr><td>Example:</td><td><a href=""/api/v1.0/20150101"">/api/v1.0/20150101</a></td></tr>"+
"<tr><td>Temperature results (min, avg, max) between provided dates (yyyymmdd):</td><td>/api/v1.0/<start>/<end></td></tr>" +
"<tr><td>Example:</td><td><a href=""/api/v1.0/20150101/20160101"">/api/v1.0/20150101/20160101</a></td></tr>"+
"</table>"
)
@app.route("/api/v1.0/precipitation")
def precipitation():
# Return a list of all precipitation
# Calculate the date 1 year ago from the last data point in the database
last_date = session.query(Measurement.date).order_by(Measurement.date.desc()).first()
print("Last Date: ", last_date.date)
# Perform a query to retrieve the data and precipitation scores
query_date = dt.date(2017, 8, 23) - dt.timedelta(days=365)
print("Query Date: ", query_date)
# Query data
results = (session.query(Measurement.date,
func.group_concat(Measurement.prcp.distinct()).label("precipitation"))
.filter(Measurement.date >= query_date)
.group_by(Measurement.date)
.order_by(Measurement.date)
.all())
# Create emtpy dict
x_result = {}
# Build dict with distinct set of precipitation values on each given day (for each station)
for result in results:
x_result.update({result.date: [result.precipitation]})
# Return
return jsonify(x_result)
@app.route("/api/v1.0/stations")
def stations():
# Return a list of all stations with counts
# Query data
results = (session.query(Measurement.station, func.count(Measurement.station).label('cnt'))
.group_by(Measurement.station)
.order_by(func.count(Measurement.station).desc())
.all())
# Create emtpy dict
x_result = {}
# Build custom dict for distinct stations ... and counts of measurements per each station
for result in results:
x_result.update({result.station: result.cnt})
return jsonify(x_result)
@app.route("/api/v1.0/tobs")
def tobs():
# query for the dates and temperature observations from a year from the last data point.
# return a JSON list of Temperature Observations (tobs) for the previous year.
# Calculate the date 1 year ago from the last data point in the database
last_date = (session.query(Measurement.date)
.filter(Measurement.station == "USC00519281")
.order_by(Measurement.date.desc()).first())
print("Last Date: ", last_date.date)
# Perform a query to retrieve the data and precipitation scores
query_date = dt.date(2017, 8, 18) - dt.timedelta(days=365)
print("Query Date: ", query_date)
results = (session.query(Measurement.date,
Measurement.tobs)
.filter(Measurement.station == "USC00519281")
.filter(Measurement.date >= query_date)
.order_by(Measurement.date)
.all())
return jsonify(results)
@app.route("/api/v1.0/<start>")
def temp_start(start):
results = (session.query(func.min(Measurement.tobs),
func.avg(Measurement.tobs),
func.max(Measurement.tobs))
.filter(Measurement.date >= start)
.all())
return jsonify(results)
@app.route("/api/v1.0/<start>/<end>")
def temp_start_end(start, end):
results = (session.query(func.min(Measurement.tobs),
func.avg(Measurement.tobs),
func.max(Measurement.tobs))
.filter(Measurement.date >= start)
.filter(Measurement.date <= end)
.all())
return jsonify(results)
if __name__ == '__main__':
app.run(debug=True)