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资料

实例

import pandas as pddf = pd.read_csv('Data/Region_Data.csv', encoding='gbk', skiprows=3, skipfooter=2, engine='python')df.head()

# df = pd.melt(df, id_vars='地区', value_vars='2015年', col_level=0)df = pd.melt(df, id_vars='地区', col_level=0)

import sqlite3 as dbwith db.connect('country_stat.sqlite') as con:    df.to_sql('region_gross_product', con=con, if_exists='replace', index=None)

with db.connect('country_stat.sqlite') as con:    sql = 'select * from region_gross_product \    where year=2015 \    order by gross_product \    desc \    limit 10'    df2 = pd.read_sql(sql, con=con)

with db.connect('country_stat.sqlite') as con:    sql = 'select area, avg(gross_product) as avg_gross_product from region_gross_product \    group by area \    having avg_gross_product >= 10000' #在 SQL 中增加 HAVING 子句原因是，WHERE 关键字无法与合计函数一起使用。    df3 = pd.read_sql(sql, con=con)