-
Notifications
You must be signed in to change notification settings - Fork 0
/
flask_app.py
142 lines (112 loc) · 4.17 KB
/
flask_app.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
import os
import numpy as np
import pandas as pd
import io
import time
import seaborn as sns
import math
from flask import Flask, render_template, request, redirect, Response
from flask_sqlalchemy import SQLAlchemy
from sqlalchemy_utils import database_exists
from matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas
from matplotlib.figure import Figure
from scipy import stats
from datetime import datetime
project_dir = os.path.dirname(os.path.realpath(__file__))
database_file = "sqlite:///{}".format(
os.path.join(project_dir, "offerdatabase.db"))
app = Flask(__name__)
app.config["SQLALCHEMY_DATABASE_URI"] = database_file
app.config["SQLALCHEMY_TRACK_MODIFICATION"] = False
db = SQLAlchemy(app)
class Offer(db.Model):
__tablename__ = 'offers'
date = db.Column(db.String(80), unique=True,
nullable=False, primary_key=True)
placement = db.Column(db.String(3), unique=True,
nullable=False, primary_key=False)
if not database_exists(database_file):
db.create_all()
db.session.commit()
def init_db():
with app.app_context():
db = get_db()
with app.open_resource('schema.sql', mode='r') as f:
db.cursor().executescript(f.read())
db.commit()
@app.route('/', methods=["GET", "POST"])
def home():
offers = None
if request.form:
try:
offer = Offer(date=request.form.get("date"),
placement=request.form.get("placement"))
db.session.add(offer)
db.session.commit()
except Exception as e:
print("Failed to add offer")
print(e)
db.session.rollback()
the_date = "No date"
offers = Offer.query.all()
if offers:
df = pd.read_sql(sql=db.session.query(Offer)
.with_entities(Offer.date,
Offer.placement).statement,
con=db.session.bind)
df.date = pd.to_datetime(df.date)
df.date = df['date'].apply(lambda d: time.mktime(d.timetuple()))
df.placement = pd.to_numeric(df.placement)
slope, intercept, r_value, p_value, std_err = stats.linregress(
df['date'], df['placement'])
if not math.isnan(slope):
the_date = datetime.fromtimestamp(-intercept/slope).date()
return render_template("home.html", offers=offers, the_date=the_date)
@app.route("/update", methods=["POST"])
def update():
try:
newdate = request.form.get("newdate")
olddate = request.form.get("olddate")
offer = Offer.query.filter_by(date=olddate).first()
offer.date = newdate
db.session.commit()
except Exception as e:
print("Couldn't update offer date")
print(e)
return redirect("/")
@app.route("/delete", methods=["POST"])
def delete():
date = request.form.get("date")
offer = Offer.query.filter_by(date=date).first()
db.session.delete(offer)
db.session.commit()
return redirect("/")
# Matplotlib stuff
@app.route('/plot.png')
def plot_png():
fig = create_figure()
output = io.BytesIO()
FigureCanvas(fig).print_png(output)
return Response(output.getvalue(), mimetype='image/png')
def create_figure():
df = pd.read_sql(sql=db.session.query(Offer)
.with_entities(Offer.date,
Offer.placement).statement,
con=db.session.bind)
df.date = pd.to_datetime(df.date)
# df.date = df['date'].apply(lambda d: time.mktime(d.timetuple()))
df.placement = pd.to_numeric(df.placement)
# Ugly regplot date hack from
# https://stackoverflow.com/questions/44354614/seaborn-regplot-using-datetime64-as-the-x-axis
df = df.sort_values('date')
df['date_of_offer'] = pd.factorize(df['date'])[0] + 1
mapping = dict(zip(df['date_of_offer'], df['date'].dt.date))
fig = Figure()
axis = fig.add_subplot(1, 1, 1)
# CHANGE THIS BACK TO date_of_offer
sns.regplot('date_of_offer', 'placement', data=df, ax=axis)
labels = pd.Series(axis.get_xticks()).map(mapping).fillna('')
axis.set_xticklabels(labels)
return fig
if __name__ == "__main__":
app.run()