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Python/查看文件最后几行.html
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213
Python/查看文件最后几行.html
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="tool" content="leanote-desktop-app">
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<title>查看文件最后几行</title>
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<style>
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*{font-family:"lucida grande","lucida sans unicode",lucida,helvetica,"Hiragino Sans GB","Microsoft YaHei","WenQuanYi Micro Hei",sans-serif;}
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body {
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margin: 0;
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}
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/*公用文字样式*/
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h1{font-size:30px}h2{font-size:24px}h3{font-size:18px}h4{font-size:14px}
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.note-container{
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width:850px;
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margin:auto;
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padding: 10px 20px;
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box-shadow: 1px 1px 10px #eee;
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}
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#title {
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margin: 0;
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}
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table {
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margin-bottom: 16px;
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border-collapse: collapse;
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}
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table th, table td {
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padding: 6px 13px;
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border: 1px solid #ddd;
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}
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table th {
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font-weight: bold;
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}
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table tr {
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background-color: none;
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border-top: 1px solid #ccc;
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}
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table tr:nth-child(2n) {
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background-color: rgb(247, 247, 249);
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}
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.mce-item-table, .mce-item-table td, .mce-item-table th, .mce-item-table caption {
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border: 1px solid #ddd;
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border-collapse: collapse;
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padding: 6px 13px;
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}
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blockquote {
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border-left-width:10px;
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background-color:rgba(128,128,128,0.05);
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border-top-right-radius:5px;
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border-bottom-right-radius:5px;
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padding:15px 20px;
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border-left:5px solid rgba(128,128,128,0.075);
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}
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blockquote p {
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margin-bottom:1.1em;
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font-size:1em;
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line-height:1.45
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}
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blockquote ul:last-child,blockquote ol:last-child {
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margin-bottom:0
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}
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pre {
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padding: 18px;
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background-color: #f7f7f9;
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border: 1px solid #e1e1e8;
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border-radius: 3px;
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display: block;
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}
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code {
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padding: 2px 4px;
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font-size: 90%;
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color: #c7254e;
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white-space: nowrap;
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background-color: #f9f2f4;
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border-radius: 4px;
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}
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.footnote {
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vertical-align: top;
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position: relative;
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top: -0.5em;
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font-size: .8em;
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}
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hr {
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margin:2em 0
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}
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img {
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max-width:100%
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}
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pre {
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word-break:break-word
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}
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p,pre,pre.prettyprint,blockquote {
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margin:0 0 1.1em
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}
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hr {
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margin:2em 0
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}
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img {
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max-width:100%
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}
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.sequence-diagram,.flow-chart {
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text-align:center;
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margin-bottom:1.1em
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}
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.sequence-diagram text,.flow-chart text {
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font-size:15px !important;
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font-family:"Source Sans Pro",sans-serif !important
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}
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.sequence-diagram [fill="#ffffff"],.flow-chart [fill="#ffffff"] {
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fill:#f6f6f6
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}
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.sequence-diagram [stroke="#000000"],.flow-chart [stroke="#000000"] {
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stroke:#3f3f3f
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}
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.sequence-diagram text[stroke="#000000"],.flow-chart text[stroke="#000000"] {
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stroke:none
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}
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.sequence-diagram [fill="#000"],.flow-chart [fill="#000"],.sequence-diagram [fill="#000000"],.flow-chart [fill="#000000"],.sequence-diagram [fill="black"],.flow-chart [fill="black"] {
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fill:#3f3f3f
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}
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ul,ol {
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margin-bottom:1.1em
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}
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ul ul,ol ul,ul ol,ol ol {
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margin-bottom:1.1em
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}
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kbd {
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padding:.1em .6em;
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border:1px solid rgba(63,63,63,0.25);
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-webkit-box-shadow:0 1px 0 rgba(63,63,63,0.25);
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box-shadow:0 1px 0 rgba(63,63,63,0.25);
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font-size:.7em;
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font-family:sans-serif;
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background-color:#fff;
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color:#333;
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border-radius:3px;
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display:inline-block;
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margin:0 .1em;
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white-space:nowrap
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}
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.toc ul {
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list-style-type:none;
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margin-bottom:15px
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}
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</style>
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<!-- 该css供自定义样式 -->
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<link href="../leanote-html.css" rel="stylesheet">
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</head>
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<body>
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<div class="note-container">
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<h1 class="title" id="leanote-title">查看文件最后几行</h1>
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<div class="content-html" id="leanote-content"><pre id="leanote_ace_1494556701760_0" class="brush:python ace-tomorrow ace_focus"># coding=utf-8
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import sys
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import time
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class Tail():
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def __init__(self,file_name,callback=sys.stdout.write):
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self.file_name = file_name
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self.callback = callback
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def follow(self,n=10):
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try:
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with open(self.file_name) as f:
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self._file = f
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self._file.seek(0,2)
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self.file_length = self._file.tell()
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self.showLastLine(n)
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while True:
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line = self._file.readline()
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if line:
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self.callback(line)
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time.sleep(1)
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except Exception,e:
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print '打开文件失败，囧，看看文件是不是不存在，或者权限有问题'
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print e
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def showLastLine(self, n):
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len_line = 100
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read_len = len_line*n
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while True:
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if read_len>self.file_length:
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self._file.seek(0)
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last_lines = self._file.read().split('\n')[-n:]
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break
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self._file.seek(-read_len, 2)
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last_words = self._file.read(read_len)
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count = last_words.count('\n')
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if count>=n:
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last_lines = last_words.split('\n')[-n:]
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break
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else:
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if count==0:
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len_perline = read_len
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else:
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len_perline = read_len/count
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read_len = len_perline * n
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for line in last_lines:
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self.callback(line+'\n')
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if __name__ == '__main__':
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py_tail = Tail('test.txt')
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py_tail.follow()
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</pre><p><br data-mce-bogus="1"></p></div>
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</div>
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<!-- 该js供其它处理 -->
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<script src="../leanote-html.js"></script>
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</body>
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</html>
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