python how to add columns to a pandas dataframe
# Basic syntax: pandas_dataframe['new_column_name'] = ['list', 'of', 'column', 'values'] # Note, the list of column values must have length equal to the number # of rows in the pandas dataframe you are adding it to. # Add column in which all rows will be value: pandas_dataframe['new_column_name'] = value # Where value can be a string, an int, a float, and etc