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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def scatter_plot(data, x, y, by=None, ax=None, figsize=None, grid=False, **kwargs):
 """ Make a scatter plot from two DataFrame columns Parameters data : DataFrame x : Column name for the x-axis values y : Column name for the y-axis values ax : Matplotlib axis object figsize : A tuple (width, height) in inches grid : Setting this to True will show the grid kwargs : other plotting keyword arguments To be passed to scatter function Returns ------- matplotlib.Figure """

    import matplotlib.pyplot as plt

    kwargs.setdefault('edgecolors', 'none')

    def plot_group(group, ax):
        xvals = group[x].values
        yvals = group[y].values
        ax.scatter(xvals, yvals, **kwargs)
        ax.grid(grid)

    if by is not None:
        fig = _grouped_plot(plot_group, data, by=by, figsize=figsize, ax=ax)
    else:
        if ax is None:
            fig = plt.figure()
            ax = fig.add_subplot(111)
        else:
            fig = ax.get_figure()
        plot_group(data, ax)
        ax.set_ylabel(pprint_thing(y))
        ax.set_xlabel(pprint_thing(x))

        ax.grid(grid)

    return fig