Editing Tutorial (section)

===Variables===
The most effective way to combine SCons and Python is to use Python to manage important variables for your scripts.  For example, if you want to test a variety of values for a certain processing Flow, then you might save the value to a variable and then let Python format it correctly for you, instead of changing the string each time you want to run a new test.  You can also save all your variables in a convenient location and then easily change them to test different parameters as well.  For example:
<syntaxhighlight lang="python">
nx = 100
nz = 100
Flow('model',None,'sfspike n1='+str(nx)+'n2='+str(nz))
</syntaxhighlight>
Note: variables must be converted to strings in order to be combined into the command statements.  Because these variables are converted using string concatenation, there is a possibility that a user could give a value of a wrong type.