使用袖扣之前我需要拥有帐户吗？

Question

遇到此错误：

Aw, snap! We didn't get a username with your request.

Don't have an account? https://plot.ly/api_signup

Questions? accounts@plot.ly

代码：

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

df=pd.DataFrame({'x':[10,20,30,40,50], 'y':[1,2,3,4,5], 'z': 
[400,500,305,502,102]})
print(df)
df.iplot(kind='surface', colorscale='rdylbu')