Variable name from a string

Question

Is this possible?

i = 1
for var in ['var1', 'var2', 'var3', 'var4']:
    eval(var) = i
    i + 1

Somehow I want to create a new variable (with new name) with each loop.

[EDIT:] A lot of people said, it's not useful so below is my actual code I wanted to use it for:

import pandas as pd

# Convert categorical variables to dummies
PPE_WAW_DISTRICT = pd.get_dummies(X['PPE_WAW_DISTRICT'], prefix='PPE_WAW_DISTRICT')
PPE_TARIFF_TYPE = pd.get_dummies(X['PPE_TARIFF_TYPE'], prefix='PPE_TARIFF_TYPE')
PPE_OSD = pd.get_dummies(X['PPE_OSD'], prefix='PPE_OSD')
VariantProdEE = pd.get_dummies(X['VariantProdEE'], prefix='VariantProdEE')
CUS_OWNER = pd.get_dummies(X['CUS_OWNER'], prefix='CUS_OWNER')
CUS_LEGAL_FORM = pd.get_dummies(X['CUS_LEGAL_FORM'], prefix='CUS_LEGAL_FORM')
CUS_CITY = pd.get_dummies(X['CUS_CITY'], prefix='CUS_CITY')
CUS_DISTRICT = pd.get_dummies(X['CUS_DISTRICT'], prefix='CUS_DISTRICT')

X.drop(['PPE_WAW_DISTRICT', 'PPE_TARIFF_TYPE', 'PPE_OSD', 'CUS_OWNER', 
               'CUS_LEGAL_FORM', 'CUS_CITY', 'CUS_DISTRICT'], axis=1, inplace=True)

X = pd.concat([PPE_WAW_DISTRICT, PPE_TARIFF_TYPE, PPE_OSD, VariantProdEE,
              CUS_OWNER, CUS_LEGAL_FORM, CUS_CITY, CUS_DISTRICT], axis=1)

Basically I want to create dummy columns from each of the selected oclumns and then with prefix add it to main dataframe (X)

Thanks, Matt

It is possible, but why would it be desirable? `exec('{} = {}'.format(var, i))` — user2390182, Sep 20 '18 at 11:29
Possible but not useful. Whatever you need to do, this is not the way to do it. — khelwood, Sep 20 '18 at 11:30
@khelwood please look at my edit. I want basically change above code into loop — Mateusz Konopelski, Sep 20 '18 at 11:36
@MateuszKonopelski You do not need different variable names for every loop iteration. — user2390182, Sep 20 '18 at 11:41
@schwobaseggl Ah your are right! I over-complicated it. I could do one column at time. — Mateusz Konopelski, Sep 20 '18 at 11:41

dangee1705 · Accepted Answer · 2018-09-20T11:36:47.043

1

You almost certainly do not want to do this, but if for some reason you still really want to you can do

i = 1
for var in ['var1', 'var2', 'var3', 'var4']:
    exec(var + "=" + str(i))
    i += 1

or for compactness,

for i, var in enumerate(['var1', 'var2', 'var3', 'var4'], 1):
    exec(var + "=" + str(i))

but as everyone else is saying, use a dictionary!

edited Sep 20 '18 at 11:36

answered Sep 20 '18 at 11:33

dangee1705

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Variable name from a string

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