def computeSumforDiffBoro(df):
'''
For the last part of question 4
'''
all_boros = df['BORO'].unique()
for boro in all_boros:
# get the data of the corresponding boro
df_boro = df[df['BORO'] == boro]
count = 0
all_ids = df_boro['CAMIS'].unique()
for id in all_ids:
r = Restaurant(id)
count = count + r.test_restaurant_grades(df_boro)
text = boro + ': the total change in restaurant grades is ' + str(count)
print text
