如何使用Plotly Express创建子图

import plotly.express as px
from plotly.subplots import make_subplots
import plotly.graph_objects as go

fig = make_subplots(rows=2, cols=2)

fig.add_trace(px.scatter(df, x='x', y='y'), row=1, col=1)
fig.add_trace(px.bar(df, x='x', y='y'), row=1, col=2)
fig.add_trace(px.line(df, x='x', y='y'), row=2, col=1)
fig.add_trace(px.histogram(df, x='x'), row=2, col=2)

fig.update_layout(height=600, width=800, title_text="子图示例")
fig.update_xaxes(title_text="X轴标题", row=1, col=1)
fig.update_yaxes(title_text="Y轴标题", row=1, col=1)

fig.show()