base.py 文件源码

def histogram(series, **kwargs):
    """Plot an histogram of the data.

    Parameters
    ----------
    series: Series, default None
        The data to plot.

    Returns
    -------
    str, The resulting image encoded as a string.
    """
    imgdata = BytesIO()
    plot = _plot_histogram(series, **kwargs)
    plot.figure.subplots_adjust(left=0.15, right=0.95, top=0.9, bottom=0.1, wspace=0, hspace=0)
    plot.figure.savefig(imgdata)
    imgdata.seek(0)
    result_string = 'data:image/png;base64,' + quote(base64.b64encode(imgdata.getvalue()))
    # TODO Think about writing this to disk instead of caching them in strings
    plt.close(plot.figure)
    return result_string