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Avoid indexation problems after dataframes concat

Sometimes after a dataframes concatenation, the indexes are melted and can cause some problems. Just ignore the index in your new dataframe:

df_Selections = pd.concat([firstSelection, secondSelection], axis=0, ignore_index=True)

 Avoid copy warning

import warnings
from pandas.core.common import SettingWithCopyWarning
warnings.simplefilter(action='ignore', category=SettingWithCopyWarning)

Avoid user warning 

import warnings
warnings.simplefilter(action='ignore', category=UserWarning)