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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
from flask import Flask, jsonify
import datetime as dt
from dateutil.relativedelta import relativedelta
#Database Setup
engine = create_engine("sqlite:///Resources/hawaii.sqlite", echo=False)
# reflect an existing database into a new model
Base = automap_base()
# reflect the tables
Base.prepare(engine, reflect=True)
Base.classes.keys()
# Save reference to the table
Measurement = Base.classes.measurement
Station = Base.classes.station
# 2. Create an app
app = Flask(__name__)
# 3. Define static routes
@app.route("/")
def index():
return (
f"<h4>List of all available api routes.</h4>"
f"<ul>"
f"<li>/api/v1.0/precipitation</li>"
f"<li>/api/v1.0/stations</li>"
f"<li>/api/v1.0/tobs</li>"
f"<li>/api/v1.0/<start></li>"
f"<li>/api/v1.0/<start>/<end></li>"
f"</ul>"
)
@app.route("/api/v1.0/precipitation")
def precipitation():
session = Session(engine)
results = session.query(Measurement.date, Measurement.prcp).all()
session.close()
precipitation = []
for date, prcp in results:
precipitation_dict = {}
precipitation_dict["date"] = date
precipitation_dict["prcp"] = prcp
precipitation.append(precipitation_dict)
return jsonify(precipitation)
@app.route("/api/v1.0/stations")
def station():
session = Session(engine)
station_data = session.query(Station.station).all()
session.close()
station_list = list(np.ravel(station_data))
return jsonify(station_list)
@app.route("/api/v1.0/tobs")
def tobs():
session = Session(engine)
active_station = session.query(Measurement.station\
).group_by(Measurement.station).order_by(func.count(Measurement.date).desc()).first()
active_max_date = session.query(func.max(Measurement.date),\
).filter(Measurement.station == active_station[0]).all()
d2 = dt.datetime(2017, 8, 18)
active_one_year_prior = d2 - relativedelta(years=1)
active_last_year = session.query(Measurement.tobs)\
.filter(Measurement.date >= active_one_year_prior).filter(Measurement.station == active_station[0])\
.order_by(Measurement.tobs.desc()).all()
session.close()
tobs_list = list(np.ravel(active_last_year))
return jsonify(tobs_list)
@app.route("/api/v1.0/<start>")
def temperature(start):
session = Session(engine)
temp_lowest = session.query(func.min(Measurement.tobs),\
).filter(Measurement.date >= start).all()
temp_highest = session.query(func.max(Measurement.tobs),\
).filter(Measurement.date >= start).all()
temp_average = session.query(func.avg(Measurement.tobs),\
).filter(Measurement.date >= start).all()
session.close()
temp_lowest_list = list(np.ravel(temp_lowest))
temp_highest_list = list(np.ravel(temp_highest))
temp_average_list = list(np.ravel(temp_average))
return (
f"TMIN: {temp_lowest_list[0]} </br>"
f"TMAX: {temp_highest_list[0]} </br>"
f"TAVG: {round(temp_average_list[0],3)}"
)
@app.route("/api/v1.0/<start>/<end>")
def temperature_range(start, end):
session = Session(engine)
temp_lowest = session.query(func.min(Measurement.tobs),\
).filter(Measurement.date >= start).filter(Measurement.date <= end).all()
temp_highest = session.query(func.max(Measurement.tobs),\
).filter(Measurement.date >= start).filter(Measurement.date <= end).all()
temp_average = session.query(func.avg(Measurement.tobs),\
).filter(Measurement.date >= start).filter(Measurement.date <= end).all()
session.close()
temp_lowest_list = list(np.ravel(temp_lowest))
temp_highest_list = list(np.ravel(temp_highest))
temp_average_list = list(np.ravel(temp_average))
return (
f"TMIN: {temp_lowest_list[0]} </br>"
f"TMAX: {temp_highest_list[0]} </br>"
f"TAVG: {round(temp_average_list[0],3)}"
)
# 4. Define main behaviour
if __name__ == "__main__":
app.run(debug=True)