matplotlib使用大字体，粗线

matplotlib在绘图时缺省的字体和线条都有些细，所以需要加粗一下

import matplotlib.pyplot as plt
def useLargeSize(axis,marker_lines = None, fontsize = 'xx-large',fontproperties=None):
    '''
      将X,Y坐标轴的标签、刻度以及legend都使用大字体,
      所有线条采用粗线
    '''
    axis.xaxis.get_label().set_size(fontsize)
    axis.yaxis.get_label().set_size(fontsize)
    #分别设置x轴和y轴上刻度值的字体大小
    for label in axis.xaxis.get_ticklabels():
        label.set_fontsize(18)
    for label in axis.yaxis.get_ticklabels():
        label.set_fontsize(18) 
    # 设置线的粗细
    LW = 2.3
    for line in axis.get_lines():
        line.set_lw( LW )
    leg = axis.get_legend()
    if(leg):
        ltext  = leg.get_texts()  # all the text.Text instance in the legend
        if(fontproperties):
            plt.setp(ltext, fontproperties=fontproperties)        
        plt.setp(ltext, fontsize='x-large')
        llines = leg.get_lines()  # all the lines.Line2D instance in the legend
        plt.setp(llines,linewidth= LW )
        if(marker_lines and len(marker_lines)>=len(llines)):
            for i in range(0,len(llines)):
                plt.setp(llines[i], 
                    marker = marker_lines[i].get_marker(), 
                    markeredgecolor= marker_lines[i].get_markeredgecolor(),\
                    markerfacecolor= marker_lines[i].get_markerfacecolor(),\
                    markeredgewidth= marker_lines[i].get_markeredgewidth(),
                    markersize= marker_lines[i].get_markersize() )