fixed local variable

app.py

@@ -127,9 +127,6 @@ def get_topic_value(row, i):
   else:
     return row[i][1]
 
-
-df = pd.DataFrame()
-
 def dataframeProcessing(dataset):
     # Opening JSON file
     f = open('stopwords-tl.json')
@@ -138,6 +135,7 @@ def dataframeProcessing(dataset):
     stopwords.update(tlStopwords)
     stopwords.update(['na', 'sa', 'ko', 'ako', 'ng', 'mga', 'ba', 'ka', 'yung', 'lang', 'di', 'mo', 'kasi'])
 
+    global df
     df = pd.read_csv('katip-december.csv')
     df.rename(columns = {'tweet':'original_tweets'}, inplace = True)
     df = df.apply(lambda row: row[df['language'].isin(['en'])])