Comptez des instances spécifiques dans un Colomb à Pandas
df.describe(include=['O']) # give count of unieque categorical
perspicuouslion
df.describe(include=['O']) # give count of unieque categorical
print df
col1 education
0 a 9th
1 b 9th
2 c 8th
len(df[df['education'] == '9th'])