如何调整Bokeh图表中坐标轴刻度数字的大小？

你代码中使用的major_label_text_font_size是调整刻度数字大小的正确属性，未生效可尝试以下解决办法：

• 统一字体单位：将刻度大小的单位统一为pt（与坐标轴标签一致），避免单位差异导致的样式失效：

  p1.xaxis.major_label_text_font_size = '20pt'
  p1.yaxis.major_label_text_font_size = '20pt'
  

• 明确指定字体样式：部分场景下仅设置大小可能被默认样式覆盖，可同时指定字体：

  p1.xaxis.major_label_text_font = 'Arial'
  p1.xaxis.major_label_text_font_size = '20pt'
  p1.yaxis.major_label_text_font = 'Arial'
  p1.yaxis.major_label_text_font_size = '20pt'
  

• 检查Bokeh版本兼容性：若使用v2.0之前的旧版本，需使用旧属性名major_label_text_size：

  p1.xaxis.major_label_text_size = '20pt'
  p1.yaxis.major_label_text_size = '20pt'
  

修改后的完整代码：

from bokeh.models.tools import HoverTool
from bokeh.models import ColumnDataSource, LinearColorMapper
from bokeh.plotting import figure, show

p1 = figure(title = "Colour Magnitude diagram of M15 - 64s exposure using PIRATE",
      x_axis_label='Colour index (B-V)', 
      y_axis_label='Apparent V magnitude')
data_source = ColumnDataSource({'B_V':ClusterDataM15['B_V'],'V':ClusterDataM15['Vmag']})
color_mapper = LinearColorMapper(palette='Magma256', low=max(ClusterDataM15['B_V']), high=min(ClusterDataM15['B_V']))
p1.scatter('B_V', 'V', source = data_source, color={'field': 'B_V', 'transform': color_mapper})
p1.y_range.flipped = True
p1.sizing_mode="stretch_both"
p1.add_tools(HoverTool())
p1.title.text_font_size = '20pt'
p1.xaxis.axis_label_text_font_size = "20pt"
p1.yaxis.axis_label_text_font_size = "20pt"

# 调整刻度数字大小
p1.xaxis.major_label_text_font = 'Arial'
p1.xaxis.major_label_text_font_size = '20pt'
p1.yaxis.major_label_text_font = 'Arial'
p1.yaxis.major_label_text_font_size = '20pt'

show(p1)

内容的提问来源于stack exchange，提问作者Merle