pandas, groupby

今天第一次用groupby

# -*- coding: utf-8 -*-
"""
Created on Mon Nov 03 18:27:22 2014

@author: Luo Hao at Tubic
"""

import pandas as pd

if __name__ == '__main__':
    df = pd.read_table('degannotation-p.dat')
    a = df['#Gene_Ref'].groupby(df['#Organism'])
    for item in a:
        with open(item[0]+'.txt', 'w') as f:
            for i in item[1]:
                print >> f, i

就是想分类输出GI号。