tweets_df=tweets_df.dropna()

 for i in tweets_df.ix[:,0]:
    if regex_getter(i) != None:
        print(regex_getter(i))

Burlington, VT
Minneapolis, MN
Bloomington, IN
Irvine, CA


 with open('Bernie.csv', 'w') as mycsvfile:
for i in tweets_df.ix[:,0]:
if regex_getter(i) != None:
    row = regex_getter(i)
    writer.writerow([i])