fix: add df to environment for the good measure

[oedokumaci]

This is to avoid cases where the generated code uses df, which gives the following error: NameError: name 'df' is not defined

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[gventuri]

Good addition, I would only conditionally passing it in case only one dataframe is passed, or we risk to pass the wrong one

[gventuri]

@oedokumaci thanks a lot for the improvement, merging!