python pandas dataframe 操做記錄

從數據看select出數據後如何轉換爲dataframe

df = DataFrame(cur.fetchall())

如何更改列名，選取列，進行groupby操做

df.columns = ['member_id', 'poi', 'num']    
df = df[['member_id','num']]
grouped = df.groupby('member_id')
df = grouped.aggregate(lambda x: sorted(list(x),reverse=True))
df = df.reset_index()

如何對dataframe進行遍歷

for index, row in df.iterrows():
    print row['c1'], row['c2']