Update app.py

app.py

@@ -48,7 +48,7 @@ def asubmit(aparam):
 		alink = ("https://data.weather.gov.hk/weatherAPI/opendata/opendata.php?dataType=CLMTEMP&year={}&rformat=csv&station={}").format(str(i),aselecteditem.values[0])
 		adf4 = pd.read_csv(alink, skiprows=[0,1,2], skipfooter=3, engine='python', on_bad_lines='skip')
 
-		adf4 = df.reset_index()  # make sure indexes pair with number of rows
+		adf4 = adf4.reset_index()  # make sure indexes pair with number of rows
 		for index, row in adf4.iterrows():
 			if (row[2]!=amonth) or (row[3]!=amonthday):
 				continue