Allow loading CSV both from local file and URL

.env.example

 MAPBOX_TOKEN=
+ORGANIZATIONS_CSV=organizations.csv

app.py

@@ -9,6 +9,10 @@ import plotly.express as px
 from dash.dependencies import Input, Output
 from dotenv import load_dotenv
 
+
+load_dotenv()
+
+
 import app_data
 
 """Interactive OpenDataFrance dashboard."""
@@ -44,8 +48,6 @@ def compute_dept_dropdown_options(reg_code=None):
     return [{"label": "-- département --", "value": ""}] + dep_list
 
 
-load_dotenv()
-
 external_stylesheets = ["https://unpkg.com/tailwindcss@^1.0/dist/tailwind.min.css"]
 
 server = flask.Flask(__name__)

app_data.py

+import os
 import unicodedata
 from collections import defaultdict
 from operator import itemgetter
@@ -9,9 +10,6 @@ import pandas as pd
 """Manage data used in dashboard."""
 
 
-ORGANIZATIONS_CSV = "organizations.csv"
-
-
 def unaccentize(str_with_accents):
     """Remove accents from the given string.
 
@@ -27,10 +25,8 @@ def unaccentize(str_with_accents):
 
 # Get data and prepare global variables.
 
-if not Path(ORGANIZATIONS_CSV).is_file():
-    raise FileNotFoundError(f"Could not find {ORGANIZATIONS_CSV!r}")
-
-df = pd.read_csv(ORGANIZATIONS_CSV)
+organizations_csv = os.getenv("ORGANIZATIONS_CSV")
+df = pd.read_csv(organizations_csv)
 df.columns = [c.replace("-", "_") for c in df.columns]
 df = df.astype({"reg_code": str, "dep_code": str})