使用matplotlib.pyplot画图时出现 couldn't connect to display "localhost:28.0" 错误的解决办法

【时间】2018.12.29

【题目】使用matplotlib.pyplot画图时出现 couldn't connect to display "localhost:28.0" 错误的解决办法

【参考链接】https://*.com/questions/19518352/tkinter-tclerror-couldnt-connect-to-display-localhost18-0

 

【出现的错误】

Traceback (most recent call last):
  File "./ThrHomoHeatmap-thrstep.py", line 179, in <module>
    p = plt.imshow(board.T, cmap = plt.cm.gist_yarg_r, vmin=0, vmax=n, origin = 'lower',  extent = [0, phi, 0, Z], aspect='auto')
  File "/usr/lib/pymodules/python2.7/matplotlib/pyplot.py", line 2370, in imshow
    ax = gca()
  File "/usr/lib/pymodules/python2.7/matplotlib/pyplot.py", line 701, in gca
    ax =  gcf().gca(**kwargs)
  File "/usr/lib/pymodules/python2.7/matplotlib/pyplot.py", line 369, in gcf
    return figure()
  File "/usr/lib/pymodules/python2.7/matplotlib/pyplot.py", line 343, in figure
    **kwargs)
  File "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_tkagg.py", line 80, in new_figure_manager
    window = Tk.Tk()
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1688, in __init__
    self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: couldn't connect to display "localhost:18.0"

 

【出现问题的原因】 问题在于，您使用的是一个交互式后端，它试图为您创建图形窗口，但由于您断开了启动模拟时可用的x服务器，所以失败了。

【解决方法】

使用非交互式后端(请参见后端？)比如：Agg(用于Png格式，PDF, SVG或PS。在生成图形的脚本中，只需在import matplotlib.pyplot as plt之前调用matplotlib.use(）即可，具体如下：

将导入更改为

import matplotlib

matplotlib.use('AGG')#或者PDF, SVG或PS

import matplotlib.pyplot as plt