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Comment by jpeloquin | Hacker News Reader

Changing the plot backend should fix this.

  import matplotlib
  matplotlib.use('Agg')
  import matplotlib.pyplot as plt

I believe Agg is only for bitmap output. While there are probably backends that work with a headless system, I find the OO option much more flexible.

Agg works for all outputs. I use it in combination with OO over ssh all the time.