Pine Marten wrote:
> 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
This whole function can be replaced with
querylist = [ int(row[0]) for rowin cur.fetchall() ]
PS Don't use tuple as a variable name, you will shadow the built-in tuple.
Kent
>
> 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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