How to create a varying variable name in python

Question

How can I create varying variable name?

like i am iterating in a loop say from 0 to 100.

I need to create different variable in each iteration and assign some values to it. an example

for i in range(0,100):
   'var'+i=i

Doesnot seems valid. I want to create variables in each iteration like var0,var1 etc and should be able to access it with that names. Can some one suggest me a solution

It is possible but it doesn't make sense. use [exec](https://docs.python.org/3/library/functions.html#exec). — Rahul, Oct 07 '17 at 06:13
You should look into [python lists](https://developers.google.com/edu/python/lists) — ayrusme, Oct 07 '17 at 06:13
create random strings...follow..https://stackoverflow.com/questions/2257441/random-string-generation-with-upper-case-letters-and-digits-in-python — Amrit, Oct 07 '17 at 06:14
This is certainly a duplicate but you should use eval or exec for this — Anton vBR, Oct 07 '17 at 06:14
@AntonvBR: I think exec will be more useful. but yeah certainly the duplicate. — Rahul, Oct 07 '17 at 06:16

score 6 · Accepted Answer · edited Oct 07 '17 at 08:34

6

To solve this, you can try something like this:

for x in range(0, 9):
    globals()['var%s' % x] = x

print var5

The globals() function produces a list-like series of values, which can be indexed using the typical l[i] syntax.

"var%s" % x uses the %s syntax to create a template that allows you to populate the var string with various values.

edited Oct 07 '17 at 08:34

E. Ducateme

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answered Oct 07 '17 at 06:17

Israel-abebe

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score 2 · Answer 2 · edited Oct 07 '17 at 06:29

2

Unless there is a strong reason to create multiple variables on the fly, it is normally in these situations to put things in a list of some sort, or a dictionary:

mydict = {'var{}'.format(i):i for i in range(1,101)}

Now access values with:

mydict["var1"] # returns 1
mydict.get("var1") # returns 1
mydict.get("var101") # returns None

edited Oct 07 '17 at 06:29

E. Ducateme

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answered Oct 07 '17 at 06:20

Anton vBR

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score 1 · Answer 3 · answered Oct 07 '17 at 06:18

1

I don't like your Idea but yeah you can do it in python:

for i in range(0,100):
    exec('var{i} = {i}'.format(i=i))

answered Oct 07 '17 at 06:18

Rahul

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score 1 · Answer 4 · answered Oct 07 '17 at 06:20

I wouldn't recommend doing this using varying variable names. Instead, you could put everything into a list and you would still be able to access each value independently. For example, you could do:

var = []
for i in range(100):
    var.append(i)

Then you can access any element from that list like so:

var[33]

This would return the number 33.

If you really did want each to be its own variable, you could use exec as others have noted.

Rahul · Answer 5 · 2017-10-07T07:57:02.547

1

You should better use dictionary for this:

var_dict = {
    'var'+str(i): i
        for i in range(10)
}
var_dict['var0']

edited Oct 07 '17 at 07:57

answered Oct 07 '17 at 06:23

Rahul

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How to create a varying variable name in python

5 Answers5