On Sat, Sep 15, 2012, Viesturs Lācis <viesturs.la...@gmail.com> wrote
> What is the syntax to put current date in the file name. In Your
> example the file name is xyz.
import datetime
open("xyz."+datetime.date.today().isoformat(),"a")
> And how can I specify the folder, in which the file is saved?
directory="/tmp/"
open(directory+"xyz."+datetime.date.today().isoformat(),"a")
Having said that, Stephen's suggestion about databases is cool if you
are willing to invest in learning them. A lot of issues such as 'will
the data be saved', 'what happens if we restart after power loss',
'which file is the latest one', are handled by the database: you write
EVERY data point, the database makes sure it finds its way to disk,
and you then use the database to sift good/relevant records out. If
you don't feel like running full MySQL system, you could run sqlite:
import sqlite3
conn=sqlite3.connect("example.db")
c=conn.cursor()
c.execute('create table planks (date text, length real)')
c.execute('insert into planks values
(\''+datetime.date.today().isoformat()+'\',12.44)')
conn.commit()
c.close()
and the data is there:
$ sqlite3 -line example.db 'select * from planks'
date = 2012-09-15
length = 12.44
length = 12.44
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