<pre><code> if option == 4:
day5 = int(input('Enter a day:'))
month5 = int(input('Enter a month:'))
year5 = int(input('Enter a year:'))
dateSelected = str(year5+'-'+month+'-'+day5)
if day == day5 and month == month5 and year == year5:
print(occurence, ' appointment starting on (', dateSelected, '): ', time, ', ', event)
</code></pre>
<p>我在“dateSelected=str(year5+'-'+month+'-'+day5)”行中得到错误。我不知道怎么解决这个问题。我找过类似的问题,也试过,但没用。你知道吗</p>