来自matplotlib的奇怪输出

Question

我试图绘制一个简单的图形，但有一些非常奇怪的输出。当我尝试在字典中绘制值（字典中的键是Ip地址）时，我得到以下输出：

root@vm:~# python makeGraph.py 
in here
still working
 : cannot connect to X server localhost:10.0

有什么可以解释这个？

 #!/usr/bin/python                                                                                                                                                                                                                      
import matplotlib.pyplot as plt

.....

for k,v in timeDifferences.iteritems():
    print 'in here'
    countArray = []
    for x in range(0,len(v)):
        countArray.append(x)
    print 'still working'
    plt.plot(countArray, timeDifferences[k])
    print 'done'