在Python中打印格式正确的SQLite表

Question

我已经编写了一个Python脚本来向表中添加行。我决定，如果我也可以使用相同的脚本查看表，而不必退出脚本并运行sqlite3或切换到另一个shell并运行sqlite3，那就太好了。因此，我写下了我期望会给我想要的东西，并做了一些...这是有问题的脚本的一部分：

import sqlite3

conn = sqlite3.connect('stu.db')
c = conn.cursor()

var = 1
while var == 1:

    enquiry = raw_input("What would you like to do?> ")

    enquiry == 'stu db' or enquiry == 'sd':
    c.execute("SELECT * FROM stu")
    conn.commit

在sqlite3中，当您运行SELECT * FROM stu时，您会得到一个格式良好的表，具有统一的行和列。当我在这里运行它时，我会在括号中找到一长串信息。看起来像这样（我没有打印出实际结果，因为这会违反某些联邦法律）：

[(1234567890, u'John Doe', 3852, u'DEGR-AA', 4, None), (1234567890, u'John Doe', 3852, u'DEGR-AA', 4, None),(1234567890, u'John Doe', 3852, u'DEGR-AA', 4, None),(1234567890, u'John Doe', 3852, u'DEGR-AA', 4, None),(1234567890, u'John Doe', 3852, u'DEGR-AA', 4, None),(1234567890, u'John Doe', 3852, u'DEGR-AA', 4, None),(1234567890, u'John Doe', 3852, u'DEGR-AA', 4, None),(1234567890, u'John Doe', 3852, u'DEGR-AA', 4, None),(1234567890, u'John Doe', 3852, u'DEGR-AA', 4, None),(1234567890, u'John Doe', 3852, u'DEGR-AA', 4, None)]

我想我知道发生了什么事。Python只是随口吐出对sqlite的查询返回的内容，但是有没有一种方法可以格式化此信息以使其易于阅读？

Answer 1

您可以pandas为此使用：

print pd.read_sql_query("SELECT * FROM stu", conn)

示例程序（python 2.7.6，pandas 0.18.0）：

import sqlite3
import pandas as pd

conn = sqlite3.connect(':memory:')
c = conn.cursor()

c.execute('create table stu ( ID, Name, ShoeSize, Course, IQ, Partner )')
conn.commit()
c.executemany('insert into stu VALUES (?, ?, ?, ?, ?, ?)',
    [(1234567890, u'John Doe', 3852, u'DEGR-AA', 4, None),
     (1234567890, u'John Doe', 3852, u'DEGR-AA', 4, None),
     (1234567890, u'John Doe', 3852, u'DEGR-AA', 4, None),
     (1234567890, u'John Doe', 3852, u'DEGR-AA', 4, None),
     (1234567890, u'John Doe', 3852, u'DEGR-AA', 4, None),
     (1234567890, u'John Doe', 3852, u'DEGR-AA', 4, None),
     (1234567890, u'John Doe', 3852, u'DEGR-AA', 4, None),
     (1234567890, u'John Doe', 3852, u'DEGR-AA', 4, None),
     (1234567890, u'John Doe', 3852, u'DEGR-AA', 4, None),
     (1234567890, u'John Doe', 3852, u'DEGR-AA', 4, None)])
conn.commit()


# Ugly way
print list(c.execute("SELECT * FROM stu"))

# Pretty way
print pd.read_sql_query("SELECT * FROM stu", conn)

结果，包括丑陋和漂亮的输出：

print pd.read_sql_query("SELECT * FROM stu", conn)