python Fetch existing variables into a list

Question

I've used locals() function and created some variables. Now I need to fetch all the variables created into a list, how should I do?

example:

column_list=[x for x in range(100)]

for i,j in enumerate(column_list):
    locals()['v'+str(i)]=pd.DataFrame(['Y','N'],columns=[j])

Now, I have variables, v0 ~ v99, each of which is an independent data frame.

I need to fetch all the variables into a variable_list

So I can use for loop on all the variables:

variable_list -> [v0,v1,v2,v3,v4.v5.......]

Don't do that... Use a dict. – Stephen Rauch Aug 06 '18 at 02:46 — Stephen Rauch, Aug 06 '18 at 02:46

wim · Answer 1 · 2018-08-06T02:53:14.433

1

Level up the abstraction. Writing to locals() is not reliable, and is advised against in the documentation.

You should change the code where it creates sequential local variables named v0, v1, ... v99 so that appends into one list named v in the first place.

Now, your "variable_list" is just v itself and the values in the list are accessible v[0], v[1], ... v[99].

edited Aug 06 '18 at 02:53

answered Aug 06 '18 at 02:47

wim

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Yea, that worked.. But I still interested in knowing how to fetch existing variables anyway – S.Gu Aug 06 '18 at 02:58

python Fetch existing variables into a list

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