CHALLENGE ACTIVITY

$15\mathrm{.}6\mathrm{.}1$: Python expressions.

$523730\mathrm{.}3915148.$qx$3$zqy$7$

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The volume of a sphere is calculated using the formula

$,$ where r is the sphere's radius.

Given variable sphere$\_$radius read from input and constant PI$,$ compute the volume of a sphere and assign sphere$\_$volume with the volume.