Document import random

BruceSherwood · BruceSherwood · commit 124357a44af7 · 2019-01-31T21:23:23.000-06:00
diff --git a/docs/VPythonDocs/math.html b/docs/VPythonDocs/math.html
@@ -28,9 +28,9 @@
       <p class="Normal">A VPython <a href="VPython_Intro.pdf" target="_blank">tutorial</a></p>
       <p class="Normal"><a href="videos.html">Introductory Videos</a></p>
       <p class="Normal"><a href="primitives.html">Pictures</a> of 3D objects</p>
-<p><select id="menu1" onchange="jumpMenu(this)"></select></p>
-<p><select id="menu2" onchange="jumpMenu(this)"></select></p>
-<p><select id="menu3" onchange="jumpMenu(this)"></select></p>
+<p><select id="menu1" onChange="jumpMenu(this)"></select></p>
+<p><select id="menu2" onChange="jumpMenu(this)"></select></p>
+<p><select id="menu3" onChange="jumpMenu(this)"></select></p>
         
     <p class="Normal"><a href="new_features.html">What's new</a></p>
     <p class="Normal"><a href="http://vpython.org" target="_blank">Classic VPython web site</a><br />
@@ -74,18 +74,22 @@ <h1 class="Heading-1"> <font color="#0000A0">Math Functions</font></h1>
         max(a,b,c,..) # maximum of these<br />
         min(a,b,c,..) # minimum of these</p>
       <p class="Normal">Many of the quantities above are short forms of the JavaScript functions Math.abs(x), Math.sqrt(x), etc. <strong><a href="factorial.html">Here are details</a></strong> of the factorial and combin functions.</p>
+      <p class="Normal">&nbsp;</p>
+      <p class="Normal">In general, Python modules cannot be imported into VPython programs, because GlowScript VPython functions in a JavaScript environment. However, one can import the Python &quot;random&quot; module into a VPython program, provided by the RapydScript-NG tool that converts Python to JavaScript. One cannot use the form &quot;from random import *&quot; but must use &quot;import random&quot; or &quot;import random as rr&quot; (or other name) or &quot;from random import randint, uniform&quot; (or other list of functions). Here is <strong><a href="https://docs.python.org/3/library/random.html">documentation</a></strong> of the Python random module. You do not need to import the random module in order to be able to use the random() function described above.</p>
+      <p class="Normal">&nbsp;</p>
       <p class="Normal">There are functions for converting between degrees and
         radians, where there are 2*pi radians in 360 degrees: </p>
       <p class="program">radians(360) &nbsp;# equal to 2*pi<br />
-        degrees(2*pi) # equal to 360</p>
+        degrees(2*pi) # equal to 360      </p>
+      <p class="Normal">&nbsp;</p>
       <p class="Normal">See JavaScript documentation on the <strong><a href="http://www.w3schools.com/jsref/jsref_obj_date.asp" target="_blank">Date</a></strong> object which provides methods for determining the current day etc. </p>
       <p class="Normal">Here is a way to determine elapsed time in seconds, with microsecond accuracy, using the clock() function that is also available in the standard Python &quot;time&quot; module. The displayed text is approximately 1.5:</p>
       <p class="program">t1 = clock()<br />
         sleep(1.5)<br />
         t2 = clock()<br />
-        print(t2-t1)</p>
-      <p class="Normal"></p>
+        print(t2-t1)      </p>
       <p class="Normal">There is also a function msclock() which gives the time in milliseconds instead of seconds.</p>
+      <p class="Normal">&nbsp;</p>
       <p class="Normal">You can <a href="MathJax.html" target="_blank"><strong>use LaTeX</strong></a> to display mathematical expressions on the page.</p>
       <br />
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