> 
> import pymel.core as pm
> 
> myNum = 5
> 
> for i in range(10):
> 
>    pm.polyCube()
>    pm.move(0,0,i*2)
> 
> pm.select('pCube5.f[myNum]')
> pm.delete()

pymel generally allows you to avoid string formatting when dealing with nodes, 
attributes, and components. for example, the above could be written like so:

import pymel.core as pm

myNum = 5
for i in range(10):
        pm.polyCube()
        pm.move(0,0,i*2)

cube = pm.PyNode('pCube5')
pm.select(cube.f[myNum])
pm.delete()

-chad


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