# Profile: Python basics. These checks run in the normal interpreter.
import math
def mean_minutes(values):
"""Return the arithmetic mean; empty input is an error."""
if not values:
raise ValueError("at least one value is required")
return sum(values) / len(values)
assert math.isclose(mean_minutes([10, 20, 30]), 20.0)
assert math.isclose(mean_minutes([12]), 12.0)
assert math.isclose(mean_minutes([0, 0]), 0.0)
try:
mean_minutes([])
except ValueError:
print("Empty-input check passed")
else:
raise AssertionError("empty input should raise ValueError")
print("Three numeric checks passed")
