定义简化版 nextDay

Question:

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###
### Define a simple nextDay procedure, that assumes
### every month has 30 days.
###
### For example:
###    nextDay(1999, 12, 30) => (2000, 1, 1)
###    nextDay(2013, 1, 30) => (2013, 2, 1)
###    nextDay(2012, 12, 30) => (2013, 1, 1)  (even though December really has 31 days)
###

def nextDay(year, month, day):
    """
    Returns the year, month, day of the next day.
    Simple version: assume every month has 30 days.
    """
    # YOUR CODE HERE
    return

Solution:

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