diff --git a/web/index_for_pdf.html b/web/index_for_pdf.html
index 73905b8..2ee7460 100644
--- a/web/index_for_pdf.html
+++ b/web/index_for_pdf.html
@@ -14,10 +14,10 @@
 <strong>audio, <a href="#audio">40</a>-<a href="#writefloatsamplestowavfile">41</a></strong>  </p>
 <h3 id="b">B</h3>
 <p><strong>basic script template, <a href="#basicscripttemplate">42</a></strong><br>
-<strong>beautifulsoup4 library, <a href="#scraping">34</a></strong><br>
+<strong>beautifulsoup4 library, <a href="#scraping">35</a></strong><br>
 <strong>binary representation, <a href="#binhex">8</a></strong><br>
 <strong>bitwise operators, <a href="#bitwiseoperators">8</a></strong><br>
-<strong>bottle library, <a href="#web">35</a></strong><br>
+<strong>bottle library, <a href="#web">36</a></strong><br>
 <strong>bytes, <a href="#bytes">28</a></strong>  </p>
 <h3 id="c">C</h3>
 <p><strong>cache, <a href="#lrucache">13</a></strong><br>
@@ -27,8 +27,10 @@
 <strong>class, <a href="#class">14</a>-<a href="#property">15</a></strong><br>
 <strong>closure, <a href="#closure">12</a></strong><br>
 <strong>collection, <a href="#collection">18</a></strong><br>
+<strong>collections module, <a href="#counter">2</a>, <a href="#namedtuple">3</a>, <a href="#abc">4</a>, <a href="#collectionsabcsequence">19</a>, <a href="#deque">29</a></strong><br>
 <strong>combinatorics, <a href="#combinatorics">8</a></strong><br>
 <strong>command line arguments, <a href="#commandlinearguments">22</a></strong><br>
+<strong>comparable, <a href="#comparable">16</a></strong><br>
 <strong>comprehension, <a href="#comprehension">11</a></strong><br>
 <strong>context manager, <a href="#contextmanager">17</a></strong><br>
 <strong>copy function, <a href="#copy">15</a></strong><br>
@@ -36,7 +38,7 @@
 <strong>curses module, <a href="#curses">34</a></strong>  </p>
 <h3 id="d">D</h3>
 <p><strong>dataclass decorator, <a href="#dataclass">15</a></strong><br>
-<strong>datetime module, <a href="#datetime">8</a>-9</strong><br>
+<strong>datetime module, <a href="#datetime">8</a>-<a href="#constructors">9</a></strong><br>
 <strong>decorator, <a href="#decorator">13</a></strong><br>
 <strong>deques, <a href="#deque">29</a></strong><br>
 <strong>dictionaries, <a href="#dictionary">2</a></strong><br>
@@ -51,6 +53,7 @@
 <strong>filter function, <a href="#mapfilterreduce">11</a></strong><br>
 <strong>floats, <a href="#abc">4</a>, <a href="#floats">6</a>, <a href="#types">7</a></strong><br>
 <strong>format function, <a href="#format">6</a>-<a href="#comparisonoffloatpresentationtypes">7</a></strong><br>
+<strong>functools module, <a href="#mapfilterreduce">11</a>, <a href="#partial">12</a>, <a href="#decorator">13</a>, <a href="#sortable">16</a></strong><br>
 <strong>futures, <a href="#threadpool">30</a></strong>  </p>
 <h3 id="g">G</h3>
 <p><strong>generator, <a href="#generator">4</a></strong>  </p>
@@ -63,8 +66,10 @@
 <strong>input function, <a href="#input">22</a></strong><br>
 <strong>introspection, <a href="#introspection">31</a></strong><br>
 <strong>ints, <a href="#abc">4</a>, <a href="#types">7</a>, <a href="#binhex">8</a></strong><br>
+<strong>is operator, <a href="#comparable">16</a></strong><br>
 <strong>iterable, <a href="#iterable">18</a></strong><br>
-<strong>iterator, <a href="#iterator">3</a>, <a href="#iterator-1">17</a></strong>  </p>
+<strong>iterator, <a href="#iterator">3</a>, <a href="#iterator-1">17</a></strong><br>
+<strong>itertools module, <a href="#itertools">3</a>, <a href="#combinatorics">8</a></strong>  </p>
 <h3 id="j">J</h3>
 <p><strong>json module, <a href="#json">25</a></strong>  </p>
 <h3 id="l">L</h3>
@@ -78,28 +83,33 @@
 <p><strong>main function, <a href="#main">1</a>, <a href="#basicscripttemplate">41</a></strong><br>
 <strong>map function, <a href="#mapfilterreduce">11</a></strong><br>
 <strong>math module, <a href="#math">7</a></strong><br>
-<strong>matplotlib library, <a href="#plot">33</a></strong><br>
+<strong>matplotlib library, <a href="#plot">34</a></strong><br>
 <strong>memoryviews, <a href="#memoryview">29</a></strong><br>
 <strong>metaprograming, <a href="#metaprograming">31</a>-<a href="#metaclass">32</a></strong><br>
+<strong>metaclass attribute, <a href="#metaclassattribute">32</a></strong><br>
 <strong>mysql library, <a href="#mysql">26</a></strong>  </p>
 <h3 id="n">N</h3>
 <p><strong>namedtuples, <a href="#namedtuple">3</a></strong><br>
 <strong>nonlocal keyword, <a href="#nonlocal">12</a></strong><br>
 <strong>numpy module, <a href="#numpy">37</a>-<a href="#indexing">38</a></strong>  </p>
 <h3 id="o">O</h3>
-<p><strong>open function, <a href="#open">22</a>-<a href="#file">23</a></strong><br>
+<p><strong>octal representation, <a href="#filesanddirectories">24</a></strong><br>
+<strong>open function, <a href="#open">22</a>-<a href="#file">23</a></strong><br>
 <strong>operator module, <a href="#operator">31</a></strong><br>
-<strong>OS commands, <a href="#oscommands">24</a></strong>  </p>
+<strong>OS commands, <a href="#oscommands">24</a>-<a href="#shellcommands">25</a></strong><br>
+<strong>os module, <a href="#path">23</a>, <a href="#oscommands">24</a>-<a href="#shellcommands">25</a>, </strong>  </p>
 <h3 id="p">P</h3>
 <p><strong>parameters, <a href="#arguments">10</a></strong><br>
 <strong>partial function, <a href="#partial">12</a></strong><br>
-<strong>paths, <a href="#path">23</a>-24</strong><br>
+<strong>paths, <a href="#path">23</a>-<a href="#pathlib">24</a></strong><br>
+<strong>pathlib module, <a href="#pathlib">24</a></strong><br>
 <strong>pickle module, <a href="#pickle">25</a></strong><br>
-<strong>PIL library, <a href="#image">38</a></strong><br>
+<strong>pillow library, <a href="#image">39</a></strong><br>
 <strong>plotting, <a href="#plot">34</a></strong><br>
 <strong>print function, <a href="#print">22</a></strong><br>
 <strong>profiling, <a href="#profiling">36</a>-<a href="#timingasnippet">37</a></strong><br>
-<strong>progress bar, <a href="#progressbar">34</a></strong>  </p>
+<strong>progress bar, <a href="#progressbar">34</a></strong><br>
+<strong>property decorator, <a href="#property">15</a></strong>  </p>
 <h3 id="q">Q</h3>
 <p><strong>queues, <a href="#queue">30</a></strong>  </p>
 <h3 id="r">R</h3>
@@ -116,18 +126,25 @@
 <strong>sets, <a href="#set">2</a></strong><br>
 <strong>shell commands, <a href="#shellcommands">25</a></strong><br>
 <strong>sleep function, <a href="#progressbar">34</a></strong><br>
+<strong>slots attribute, <a href="#slots">15</a></strong><br>
+<strong>sortable, <a href="#sortable">16</a></strong><br>
 <strong>splat operator, <a href="#splatoperator">10</a>-<a href="#otheruses">11</a></strong><br>
 <strong>statistics module, <a href="#statistics">7</a></strong><br>
 <strong>strings, <a href="#string">5</a></strong><br>
 <strong>struct module, <a href="#struct">28</a></strong>-<a href="#integertypesusecapitalletterforunsignedtypestandardsizesareinbrackets">29</a></strong><br>
-<strong>synthesizer, <a href="#synthesizer">41</a></strong>  </p>
+<strong>synthesizer, <a href="#synthesizer">41</a></strong><br>
+<strong>sys module, <a href="#lrucache">15</a>, <a href="#commonbuiltinexceptions">21</a>, <a href="#print">22</a>, <a href="#commandlinearguments">22</a></strong> </p>
 <h3 id="t">T</h3>
 <p><strong>table, <a href="#table">34</a></strong><br>
+<strong>template function, <a href="#dynamicrequest">36</a></strong><br>
 <strong>threading module, <a href="#threading">30</a></strong><br>
 <strong>time module, <a href="#progressbar">34</a>, <a href="#stopwatch">36</a></strong><br>
+<strong>timeit module, <a href="#timingasnippet">37</a></strong><br>
+<strong>timezones, <a href="#timezone">9</a></strong><br>
 <strong>tqdm library, <a href="#progressbar">34</a></strong><br>
 <strong>tuples, <a href="#tuple">3</a></strong><br>
 <strong>type, <a href="#type">4</a>, <a href="#type-1">31</a></strong>  </p>
 <h3 id="w">W</h3>
-<p><strong>web, <a href="#web">36</a></strong>  </p> 
+<p><strong>wave module, <a href="#audio">40</a>-<a href="#writefloatsamplestowavfile">41</a></strong><br>
+<strong>web, <a href="#web">36</a></strong>  </p> 
 </div>
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