Russ hensel: 1 revision

2017-01-06T17:28:54Z

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Russ hensel: /* Overview */

2016-10-14T17:25:18Z

Overview

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= Overview =

Sometimes, for example if you wanted to simulate throwing a die, it is useful for the computer to generate random numbers. There are, as usual, a ton of ways to do this, but here we will keep it simple. If you want more complexity ( or perhaps more detail than this page ) use the links below. Please copy the code into your environment and run it.

----

= A Simple Example =
All these do the same thing with slight different styles, the first A works but is poor style for sure.

For any of this code to work you have to have this statement first:

<pre>
import random # this gives you access to the random "library"
</pre>

Here is the first simple, but not good style code. Should be easy to understand.
<pre>
print "randrange 1 to 11 gives numbers including 1 to 10 -- run it 10 times A"

print "randrange( 1, 11, ) : ", random.randrange( 1, 11, ) # two items are printed just separate by a comma
print "randrange( 1, 11, ) : ", random.randrange( 1, 11, ) # the first item printed is a literal
print "randrange( 1, 11, ) : ", random.randrange( 1, 11, ) # the second item is a call to the random function
print "randrange( 1, 11, ) : ", random.randrange( 1, 11, )
print "randrange( 1, 11, ) : ", random.randrange( 1, 11, )
print "randrange( 1, 11, ) : ", random.randrange( 1, 11, )
print "randrange( 1, 11, ) : ", random.randrange( 1, 11, )
print "randrange( 1, 11, ) : ", random.randrange( 1, 11, )
print "randrange( 1, 11, ) : ", random.randrange( 1, 11, )
print "randrange( 1, 11, ) : ", random.randrange( 1, 11, )

</pre>

When code is repeated it is better style code to put it in a loop ( and perhaps define a function, something we will not do here ).
<pre>
print "randrange 1 to 11 gives numbers including 1 to 10 -- run it 10 times B"
for ix in range( 0, 10 ):
print "randrange( 1, 11, ) : ", random.randrange( 1, 11, )

</pre>

This code is slightly different by putting the random value in a variable before printing it.
<pre>

print "randrange 1 to 11 gives numbers including 1 to 10 -- run it 10 times C"
for ix in range( 0, 10 ):
random_number = random.randrange( 1, 11, )
print "randrange( 1, 11, ) : ", random_number

</pre>

= Links =

*'''[https://docs.python.org/2/library/random.html 9.6. random — Generate pseudo-random numbers — Python 2.7.12 documentation ]'''
*'''[https://stackoverflow.com/questions/3996904/generate-random-integers-between-0-and-9 python - Generate random integers between 0 and 9 - Stack Overflow ]'''
*'''[https://www.tutorialspoint. com/python/python_lists.htm Python Lists ]'''
*'''[https://pymotw.com/2/random/ random – Pseudorandom number generators - Python Module of the Week ]'''
*'''[http://www.pythonforbeginners.com/random/how-to-use-the-random-module-in-python How to use the Random Module in Python ]'''
*'''[https://www.tutorialspoint. com/python/number_randrange.htm Python Number randrange() Method ]'''

[[Category:Draft]] [[Category:Python]] [[Category:Python Course]]

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