variable within a whereclause

Question

I am a novice with arcpy.

I would like to use the arcpy.Select_analysis to select a featureclass with a selection based on an attibute and a txtfile. 
All is working except that the where clasue does not like it when I try to install a variable.  Such as:

arcpy.Select_analysis(fromFC, line[:-1]+"\output_temp", exp)

the FromFC is the FC I am coping from. 
the line[:-1]+"\output_temp" is the FC I am pushing the selection of the FromFC to, ans
exp is the expression -  exp = '"SystemOwner" = \'Rockingham\''

Rockingham is in the place I would like to put the variable as I have several towns to run through.  I am not sure of the syntax by which to add the variable, as defined in an open statement for a textfile.

Any ideas or suggestions?

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MathewCoyle · Answer

You'd just need to use string substitution. Something like this.exp = '"SystemOwner" = \'{0}\''.format(variable)