Hotfix DWD data retrieval for modern pandas

corny/exdata/roverweb/weather.py

@@ -43,7 +43,8 @@ import io
 import sys
 from pdb import set_trace as debug
 from corny.basics import col_is_unique, progressbar, cprintf
-
+import warnings
+warnings.simplefilter(action='ignore', category=pd.errors.PerformanceWarning)
 #######
 
 def findkeys(node, kv):
@@ -239,7 +240,9 @@ def update_stationlist(time_res='hourly',dbase_dir='dbase',data_category='air_tr
         #add true information to category
         dfstations[category]=True
 
-        stations_network=stations_network.append(dfstations,sort=False,ignore_index=True)
+        stations_network = pd.concat(
+            [ stations_network, dfstations ],
+            sort=False, ignore_index=True)
         #A=[sub.split(" ") for sub in stationlist]
 
     #replace all Na by False