import math

print(round(1.33, 1))
print(round(1.37, 1))
print(round(-1.37, 1))
print(round(math.pi, 3))

print(format(math.pi, '0.2f'))
print(format(math.pi, '0.3f'))

print('El valor de {} redondeado a 3 decimales es {:0.3f}'.format(math.pi, math.pi))