python简单的绘制折现图

转载自：http://blog.csdn.net/zhx6044/article/details/50740139

在做一些数据统计时，折现图能够看出变化的趋势，最近查内存泄漏，跑了一个晚上的数据，想查查，那么折现图能够给一个很直观的结果。

我们使用pylab包来绘制图形。 
我使用pip来管理python包

<code class="language-sh hljs bash has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">sudo</span> pip install pylab</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

时间比较长，其会下载一些依赖的包。

<code class="language-python hljs  has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">#!/usr/bin/python</span>

<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> os
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> matplotlib.pyplot <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">as</span> plt

allFile = []


r = open(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'result'</span>, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'w'</span>)


heap = []   


<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> filename <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> sorted(os.listdir(os.path.dirname(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'./'</span>))):
    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> filename.endswith(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'.txt'</span>):
        allFile.append(filename)



<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> afile <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> allFile:
    f = open(afile);
    data = f.readlines();
    t = data[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1699</span>].split(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">':'</span>)[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>].strip()
    heap.append(int(t))
    r.write(t + <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'\n'</span>)


r.close();



dataLen = len(heap)



plt.plot(range(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>, dataLen + <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>), heap)

plt.show()
</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li></ul>

这是我写的简单的统计程序。

<code class="language-python hljs  has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;">plt.plot()</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

接受两个参数，分别是x，y轴的数据。

结果如图：