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## basic analysis of data stored into a df
def dfanalysis(df:'dataframe')->'dataframe':
    """
    Basic analysis of data stored into a df.
    df -- df of data.
    return -- df with the basic statistics.
    """
    from pandas import concat, DataFrame
    return concat([df.describe().transpose(),
            DataFrame(df.isnull().sum(),columns=['nnull']),
            DataFrame(df.dtypes,columns=['dtypes'])],axis=1)