Question

我有一个包含20列和100行的CSV文件。我想用两个列创建一个SQLite数据库 - 第1列中的日期和温度是第10列。我修改了一些我找到的示例代码，但我不确定如何使用这两列。< / p>

import csv, sqlite3
import sys

filename = sys.argv[-1]

con = sqlite3.connect("my.db")
con.execute("create table stats(date, temperature)")                               
cur = con.cursor()

stats = csv.reader(open(filename))

con.executemany("insert into stats(date, temperature) values (?, ?)", stats)

con.commit()

Answer 1

con.executemany("insert into stats(date, temperature) values (?, ?)",
                ((rec[0], rec[9]) for rec in stats))

Answer 2

您可以使用pandas 只读取指定的列并将其写入DB

import sqlite3
from pandas.io import sql
import pandas as pd
from StringIO import StringIO

s = """Year,Make,Model
1997,Ford,E350
2000,Mercury,Cougar"""

f = StringIO(s)
df = pd.read_csv(f, usecols = ['Year','Model']) # reads specified cols
                                                # to a DataFrame

con = sqlite3.connect(':memory:')
sql.write_frame(df, name='test', con=con)

print sql.read_frame('select * from test', con) # reads data back 
                                                # to DataFrame

出：

   Year   Model
0  1997    E350
1  2000  Cougar

仅从CSV导入两列

2 个答案: