diameter = 4
if diameter < 0:
print "You can't have a negative diameter!"
else:
circumference = pi * diameter
print "The circumference of a circle with diameter", diameter, "is", circumference.n()
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The circumference of a circle with diameter 4 is 12.5663706143592
The circumference of a circle with diameter 4 is 12.5663706143592
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