KeyError: 'plotly_domain' when using plotly to do scatter plot in python

问题

I'm using plotly to do scatter plot. The graph is generated on my account but the terminal still reports an error:

Traceback (most recent call last):
File "IEORE4709HW1.py", line 106, in <module>
py.iplot(data, filename='basic-scatter')
File "/Library/Python/2.7/site-packages/plotly/plotly/plotly.py", line 175, in iplot
return tools.embed(url, **embed_options)
File "/Library/Python/2.7/site-packages/plotly/tools.py", line 412, in embed
!= session.get_session_config()['plotly_domain']):
KeyError: 'plotly_domain'

My code is:

import urllib2
import numpy as np

import plotly.plotly as py
py.sign_in('halblooline', 'j90503v8gq')
import plotly.graph_objs as go
import numpy as np

N = 1000
random_x = np.random.randn(N)
random_y = np.random.randn(N)

# Create a trace
trace = go.Scatter(
    x = random_x,
    y = random_y,
    mode = 'markers'
)

data = [trace]

# Plot and embed in ipython notebook!
py.iplot(data, filename='basic-scatter')

# or plot with: plot_url = py.plot(data, filename='basic-line')

Any one could help me with this? Thank you very much.