shiftValue.py

def shiftValue(value, values=[35, 70, 100, 120, 150]):

    if value in values:
        index = values.index(value)
        if not len(values) - 1 == index:
            return values[index + 1]
        else:
            return values[0]
    else:
        return values[0]


try:
    value
except:
    value=0
value=shiftValue(value)
print value