[英]Printing a properly formatted SQLite table in Python
I've written a Python script to add rows to my tables. 我编写了一个Python脚本来向表中添加行。 I decided it would be nice if I could also view my tables with the same script instead of having to either quit the script and run sqlite3 or switch to another shell and run sqlite3.
我决定如果我还可以使用相同的脚本查看我的表而不必退出脚本并运行sqlite3或切换到另一个shell并运行sqlite3,那将是很好的。 So I wrote up what I expected would give me what I want and it sort of does... This is the part of the script in question:
所以我写了我期望的东西会给我我想要的东西,它有点......这是问题脚本的一部分:
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
In sqlite3 when you run SELECT * FROM stu you get a nicely formatted table with uniform rows and columns. 在sqlite3中,当您运行SELECT * FROM stu时,您将获得一个格式良好的表,其中包含统一的行和列。 When I run it here I get a long list of the information in parenthesis instead.
当我在这里运行时,我会在括号中获得一长串信息。 It looks sort of like this (I didn't print the actual results as that would violate some Federal laws):
它看起来有点像这样(我没有打印实际结果,因为这违反了一些联邦法律):
[(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)]
I think I know what's going on. 我想我知道发生了什么事。 Python is just spitting out what the query to sqlite returns, but is there a way to format this information so that it is easily readable?
Python正在吐出sqlite返回的查询,但有没有办法格式化这些信息,以便它易于阅读?
You can use pandas
for this: 您可以使用
pandas
:
print pd.read_sql_query("SELECT * FROM stu", conn)
Sample program (python 2.7.6, pandas 0.18.0): 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)
Result, which includes both the ugly and the pretty output: 结果,包括丑陋和漂亮的输出:
[(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)]
ID Name ShoeSize Course IQ Partner
0 1234567890 John Doe 3852 DEGR-AA 4 None
1 1234567890 John Doe 3852 DEGR-AA 4 None
2 1234567890 John Doe 3852 DEGR-AA 4 None
3 1234567890 John Doe 3852 DEGR-AA 4 None
4 1234567890 John Doe 3852 DEGR-AA 4 None
5 1234567890 John Doe 3852 DEGR-AA 4 None
6 1234567890 John Doe 3852 DEGR-AA 4 None
7 1234567890 John Doe 3852 DEGR-AA 4 None
8 1234567890 John Doe 3852 DEGR-AA 4 None
9 1234567890 John Doe 3852 DEGR-AA 4 None
The way I've done this in the past is to simply use a pandas data frame. 我过去这样做的方法就是简单地使用pandas数据框。
import pandas as pd
data = [(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)]
pd.DataFrame(data)
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