【1】写一个函数，计算给定日期是该年的第几天．

 1 #coding=utf-8
 2 #写一个函数，计算给定日期是该年的第几天．
 3 
 4 
 5 def count(year,month,day):
 6     count = 0
 7     #判断该年是平年还是闰年
 8     if year%400==0 or (year%4==0 and year%100!=0):
 9         print('%d年是闰年，2月份有29天！'%year)
10         li1 = [31,29,31,30,31,30,31,31,30,31,30,31]
11         for i in range(month-1):
12             count += li1[i]
13         return count+day
14     else:
15         print('%d年是平年，2月份有28天！' % year)
16         li2 = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
17         for i in range(month-1):
18             count += li2[i]
19         return count+day
20 
21 
22 if __name__ == "__main__":
23     year = int(input('请输入年份：'))
24     month = int(input('请输入月份：'))
25     day = int(input('请输入日期：'))
26     count = count(year,month,day)
27     print('%d年%d月%d日是今年的第%d天！'%(year,month,day,count))