Python Plotly-为什么两个曲面图显示不同的结果？

我尝试了两种方法来绘制曲面图，但不确定为什么会得到不同的结果

我做的第一件事：

import pandas as pd
import numpy as np
import cufflinks as cf
cf.go_offline()
from plotly.offline import download_plotlyjs,init_notebook_mode,plot,iplot
init_notebook_mode(connected=True)
import plotly.graph_objects as go

df3 = pd.DataFrame({'x':[1,2,3,4,5],'y':[10,20,30,20,10],'z':[5,4,3,2,1]})
go.Figure(data=go.Surface(x=df3['x'],y=df3['y'],z=[df3['z']]*5))

df3.iplot(kind='surface',x='x',y='y',z=['z']*5)

我做的第二件事：

import pandas as pd
import numpy as np
import cufflinks as cf
cf.go_offline()
from plotly.offline import download_plotlyjs,init_notebook_mode,plot,iplot
init_notebook_mode(connected=True)
import plotly.graph_objects as go

df3 = pd.DataFrame({'x':[1,2,3,4,5],'y':[10,20,30,20,10],'z':[5,4,3,2,1]})
go.Figure(data=go.Surface(x=df3['x'],y=df3['y'],z=[df3['z']]*5))

df3.iplot(kind='surface',x='x',y='y',z=['z']*5)