I'm a novice hoping to use data stored in an SQLite database to make simple
graphs using matplotlib embedded in a wxPython GUI. I noticed that
matplotlib uses lists of integers to make graphs, such as the simple example
(from the tutorial) of:
from pylab import *
plot([1,2,3,4])
show()
But SQLite queries return as a list of tuples in rows, not a list of
numbers. For some reason I haven't found a way any ready-made converter for
this purpose. As an exercise, I've wrote this function that converts them:
#takes the result of a fetchall() in sql and returns it as a list of numbers
#assumes you've done the query first, i.e. cur.execute('SELECT * FROM
table')
import sqlite3
import string
def query_to_list():
queryresult = cur.fetchall()
print "Queryresult is ", queryresult
queryrows = []
for tuple in queryresult:
num = tuple[0]
queryrows.append(num)
querylist = []
for row in queryrows:
num = int(row)
querylist.append(num)
print "Query list is: ", querylist
My question is, is there a better way to do this, or is there a ready-made
way to go from an sql database to matplotlib? I tried searching for it in
various ways but haven't found anything. I feel as though there should be a
more direct way to go from a db to a plot.
Thanks in advance,
Chae
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