Chuck Allison wrote:
> Hello tutor,
>
> I notice that with 'print >> f' one can print the string
> representation of objects to a file. Is there a corresponding input
> facility that parses through a file creating objects? I can't find
> one. In the meantime, I did this:
>
>
>>>>f = open('out.dat','w')
>>>>print >> f, 1, 2
>>>>f.close()
>>>>s = open('out.dat').read()
>>>>x,y = tuple(map(eval,s.split()[:2]))
>>>>x,y
>
> (1, 2)
>
> This is just what came to mind without thought. Is there a Pythonic
> way to read formatted objects? Thanks.
>
If you want to save objects to a file and reread them later, the best
solution is pickle:
http://www.python.org/doc/2.4.1/tut/node9.html#SECTION009220000000000000000
and
http://www.python.org/doc/2.4.1/lib/module-pickle.html
HTH,
Wolfram
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