[Tutor] Using a string to get at a Variable
hcohen2 at comcast.net
Mon Jan 19 13:22:21 EST 2004
Isr Gish wrote:
> >From: "hcohen2"<hcohen2 at comcast.net>
> >Sent: 1/18/04 9:29:03 PM
> >To: "Isr Gish"<isrgish at fusemail.com>
> >Cc: "Tutor"<tutor at python.org>
> >Subject: Re: [Tutor] Using a string to get at a Variable
> >Isr Gish wrote:
> >>I'm trying to get the data from a variable using a string.
> >>For example I have three variables named apples, grapes, pears. Then I have a list with these 3 names as strings.
> >>Now I would like to do a loop on the list and getsthe data from each name.
> >>Any help would be greatly appreciated.
> >>Thanks in Advance
> >>Isr Gish
> >>Tutor maillist - Tutor at python.org
> >You are not very explicit on either on what you on working with nor the
> >sort of object that contains the data you are seeking to extract, hence,
> >I will just outline an example of my own design.
> >Let's say you get you set of variables as a tuple: (var_1, var_2, ...,
> >var_n) - I am going to assume these variables are names of lists. So I
> >see no real need to convert them to strings. If that is indeed
> >necessary, skip the entire discussion.
> >#Intermediate result
> >names_tuple = (var_1, var_2, ..., var_n)
> >len_tuple = len(names_tuple)
> >for j in range(len_tuple):
> > try:
> > len_obj = len(var_j)
> > for i in range(len_obj):
> > value_of_obj(i) = var_i[i]
> > try:
> > print 'Show me the value of %s' %
> > print var_i[i]
> > # Or do whatever you have in mind, e.g.
> >storing in a dictionary, etc.
> > except ValueError, TypeError, diag: #
> >regarding the errors I am guessing
> > print str(diag)
> > except TypeError, RangeError, diag:
> > print str(diag)
> >I am not sure how useful you will find this nor how close it is to
> >solving the problem you are attacking - just recognize I am new at
> >python. Moreover, I may miss the clues to the type of problem, since my
> >specialty is databases and much of the discussion here leaves me a bit
> >puzzled as to where they are being applied.
> >In any case, I hope it helps a bit.
>I don't understand the code you wrote, and what exactly its supposed to do.
>But this is what I'm looking for.
>apples = 10
>grapes = 5
>pears = 8
>fruits = ['apples', 'grapes', 'pears']
>Now Iswant to be able to do something like this.
>for fruit in fruits:
> print 'You heve %d' % (fruit), fruit
>And the output should look like this:
>You have 10 apples
>You have 5 grapes
>You have 8 pears
>Thanks for the reply and if anyone can help it would be appreciated.
>Tutor maillist - Tutor at python.org
Sorry, I tend to look for complex problems and obviously I misread your
question. My response is perhaps a reflection of my thoughts: getting a
intermediate set of objects that are themselves objects that hold data.
Again sorry for the confusion - got too excited wondering what you could
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