绘制一个进程的CPU使用率

感谢Vamei的matplotlib 的文章：
http://www.cnblogs.com/vamei/archive/2013/01/30/2879700.html

代码如下：
首先用psutil 获得进程的CPU 使用率，然后再用matplotlib绘图。

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1. import psutil
   
2. import sys
   
3. import re
   
4. ll=[]
   
5. def processinfo(pid):
   
6.     p=psutil.Process(pid)
   
7.     for i in range(10):
   
8.         #print(p.cpu_percent(interval=3))
   
9.         ll.append(p.cpu_percent(interval=1))
   
10.     return ll
    
11. 
    
12. 
    
13. #print(processinfo(1051))
    
14. import random
    
15. from matplotlib.figure import Figure
    
16. from matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas
    
17. def plot_cpu_usage(y):
    
18.     x=list(range(3,31,3)) #x
    
19.     #I will manipulate Y if ll is empty 
20.     if not y:
21.         y=[random.randint(1,5) for i in range(10)] #y
    
22.    
23.     fig = Figure()
    
24.     canvas = FigureCanvas(fig)
    
25.     ax = fig.add_axes([0.1, 0.1, 0.8, 0.8])
    
26.     line, = ax.plot(x,y)
    
27.     ax.set_title("cpu usage for PID 1051")
    
28.     ax.set_xlabel(" time in seconds ")
    
29.     ax.set_ylabel(" cpu usage in %")
    
30.     canvas.print_figure('demo.jpg')
    
31. 
    
32. #processinfo(1051)
    
33. plot_cpu_usage(ll)

另外我发现3.5的python 跟matplotlib 配合使用的时候，无法使用GTKAgg 作为backend. 

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1. #next 5 lines error out on Kali linux with python3.5, but works with python2.7
   
2. import matplotlib as mpl
3. mpl.use('GTKAgg')        #use GTK UI        
   
4. mpl.use('GTKCairo')
   
5. import matplotlib.pyplot as plt
   
6. plt.plot([1,3,2,4])
   
7. plt.show()

但是我可以正常的import Gtk 

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1. python3
   
2. import gi
   
3. gi.require_version('Gtk','3.0')
   
4. from gi.repository import Gtk as gtk