Re: [Tutor] Reference a variable from a string whose value is the name of the variable

[Andre Roberge]

I'm not sure if it's exactly what you need, but here's something that may come close.

On 6/5/06, Peter Jessop <[EMAIL PROTECTED] > wrote:

The best way to explain my problem is with an example

f0_n = "field0"
f0_v ="value0"
f1_n="field1"
f1_v="value1"
...

f100_n = "field100"
f100_v = "value100"

Ok, I'm going to recreate this fake example, rather than typing it all out :-)
for i in range(101):
    print 'f%d_n = "field%d"'%(i, i)
    print 'f%d_v = "value%d"'%(i, i)

I then cut-and-paste the result in the editor window and start again.


data1 = ["(f%d_n, f%d_v)"%(i, i) for i in range(101)]

print data1
# This shows: ['(f0_n, f0_v)', '(f1_n, f1_v)', '(f2_n, f2_v)' ... '(f100_n, f100_v)']

data2 = ','.join(data1)
data2 = '[' + data2 + ']'
print eval(data2)

The result is: [('field0', 'value0'), ('field1', 'value1'), ..., ('field100', 'value100')]
i.e. it is a list of 2ples that contains the values of the variable, rather than the variables themselves.  For most applications, this should be the same thing, right?

André
 

I now want to define a list of 2ples of the form

[(f0_n,f0_v),(f1_n,f1_v),...,(f100_n,f100_v)]

I wish to define the list using a for loop, i.e.

data = [ ]
for i in xrange(1,101):
  data = "" ((f %i  _n, f %i_v))

I have put the % sign above. Obviously it is not like that but how
does one do it?
The aim is to reference the s variable whose name is the string that I
create concatenating "f" + str(i)+"_n" and "f"+str(i)+"_v"

Thanks

Peter Jessop
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