From 520be4fe4cd388fc772f9da9f6057e9997c1aa39 Mon Sep 17 00:00:00 2001
From: Hui Lan <lanhui@zjnu.edu.cn>
Date: Mon, 1 Apr 2019 21:01:18 +0800
Subject: updated lecture notes

---
 LectureNotesOnPython.html | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'LectureNotesOnPython.html')

diff --git a/LectureNotesOnPython.html b/LectureNotesOnPython.html
index 4333633..eb0b066 100644
--- a/LectureNotesOnPython.html
+++ b/LectureNotesOnPython.html
@@ -815,7 +815,7 @@ A list of objects</dd>
 <p>'a' in 'banana'
 'seed' in 'banana'</p>
 <p>练习：写出下面的函数，使得
-in_both('apples', 'oranges')返回'aes'</p>
+in_both('apples', 'oranges')返回'aes'。</p>
 </div>
 <div class="section" id="id7">
 <h1><a class="toc-backref" href="#id29">字符串比较</a></h1>
@@ -1170,6 +1170,7 @@ error-prone（易错）</p>
     <span class="keyword">for</span> <span class="name">x</span> <span class="operator word">in</span> <span class="name">lst</span><span class="punctuation">:</span>
         <span class="keyword">print</span><span class="punctuation">(</span><span class="literal string single">'</span><span class="literal string interpol">%s</span><span class="literal string single"> (</span><span class="literal string interpol">%d</span><span class="literal string single">)'</span> <span class="operator">%</span> <span class="punctuation">(</span><span class="name">x</span><span class="punctuation">[</span><span class="literal number integer">0</span><span class="punctuation">],</span> <span class="name">x</span><span class="punctuation">[</span><span class="literal number integer">1</span><span class="punctuation">]))</span>
 </pre>
+<p>练习： 改写函数 <tt class="docutils literal">word_frequency</tt> ， 使它能接受第三个参数， <tt class="docutils literal">black_lst</tt>。 <tt class="docutils literal">black_lst</tt> 是包含要排除考虑的单词的列表。 例如， <tt class="docutils literal">black_lst</tt> 可以是 <tt class="docutils literal">['the', 'and', 'of', 'to']</tt> 。</p>
 </div>
 <div class="section" id="keyvalue">
 <h2><a class="toc-backref" href="#id37">key与value互换</a></h2>
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