use urljoin

Author: wholmgren

pvlib/iotools/psm4.py

@@ -5,18 +5,18 @@
 """
 
 import io
+from urllib.parse import urljoin
 import requests
 import pandas as pd
 from json import JSONDecodeError
 
-NSRDB_API_BASE = "https://developer.nrel.gov"
-API_STUB = "/api/nsrdb/v2/solar/"
+NSRDB_API_BASE = "https://developer.nrel.gov/api/nsrdb/v2/solar/"
 GOES_ENDPOINT = "nsrdb-GOES-aggregated-v4-0-0-download.csv"
 TMY_ENDPOINT = "nsrdb-GOES-tmy-v4-0-0-download.csv"
 GOESCONUS_ENDPOINT = "nsrdb-GOES-conus-v4-0-0-download.csv"
-GOES_URL = NSRDB_API_BASE + API_STUB + GOES_ENDPOINT
-TMY_URL = NSRDB_API_BASE + API_STUB + TMY_ENDPOINT
-GOESCONUS_URL = NSRDB_API_BASE + API_STUB + GOESCONUS_ENDPOINT
+GOES_URL = urljoin(NSRDB_API_BASE, GOES_ENDPOINT)
+TMY_URL = urljoin(NSRDB_API_BASE, TMY_ENDPOINT)
+GOESCONUS_URL = urljoin(NSRDB_API_BASE, GOESCONUS_ENDPOINT)
 
 ATTRIBUTES = (
     'air_temperature', 'dew_point', 'dhi', 'dni', 'ghi', 'surface_albedo',