python打印日历

    #未优化的代码
  1 #输出日历
 def print_calendar(year,month,date = 1):
     month_dict = {'':'January','':'February','':'March','':'April','':'May','':'June','':'July',
                   '':'August','':'September','':'October','':'November','':'December'}

     #数字月份转换为字符串,并判断月份和号数是否合法
     if month in range(1,13) and date in range(1,31):
         month_str = str(month)
         if month_str in month_dict:
             month_str = month_dict[month_str]
     else:
         print('月份或号数输入不合法')
         return -1

     #头部
     print('%15s%8d'%(month_str,year))
     print('-'*33)
     print('Sun  Mon  Tue  Wed  Thu  Fri  Sat')

     #得到每月1号是星期几
     first_day = get_start_day(year,month,1)
     #得到此月有多少天
     month_num = days_of_month(year,month)

     each_day = 0
     #主体
     for index in range(1,43):

         if index < first_day + 1:
             print(' '*5,end = '')
         else:
             if (index - 1) % 7 == 0:
                 print('')
             each_day += 1
             if each_day > month_num:
                 return False
             if each_day < 10:
                 if each_day == date:
                     print('%-5s'%('--'),end = '')
                 else:
                     print(' %-4d'%(each_day),end = '')
             else:
                 if each_day == date:
                     print('%-5s'%('--'),end = '')
                 else:
                     print('%-5d'%(each_day),end = '')

 #输入一个年月日，判断是星期几
 #需要一个比较标准：2010-1-1是星期五
 #计算当前距离标准过了多少天(total_days % 7  + 5 -1)%7
 #先遍历年份，是闰年+366，不是+365
 #再遍历月份，31,30,29,28
 def get_start_day(year,month,date):
     total_days = 0
     #遍历年份
     for one_year in range(2010,year):
         if is_leap_year(one_year):
             total_days += 366
         else:
             total_days += 365
     #print(total_days)
     #遍历月份
     for one_month in range(1,month):
         total_days += days_of_month(year,one_month)
     #print(total_days)
     #加上当月号数,则求得总共过了多少天
     total_days += date

     #求输入的年月日是星期几
     day = (total_days % 7 + 5 - 1) % 7

     #print(total_days)
     #print(day)
     return day

 #输入一个年份和月份，输出这月有多少天
 #1,3,5,7,8,10,12--------31天
 #4,6,9,11 --------------30天
 #如果是闰年2------------29天
 #不是闰年 2-------------28天
 def days_of_month(year,month):
     days = 0
     if month in (1,3,5,7,8,10,12):
         days = 31
     elif month in (4,6,9,11):
         days = 30
     elif is_leap_year(year):
         days = 29
     else:
         days = 28
     return days

 def is_leap_year(year):
     if year % 4 == 0 and year % 100 != 0 or year % 400 == 0:
         return True
     return False

 def main():
     print('*'*33)
     year = int(input('请输入年份：'))
     month = int(input('请输入月份：'))
     date = int(input('请输入号数：'))
     print('*'*33)
     #某年某月有多少天
     #days = days_of_month(year,month)
     #print('{}年{}月有{}天'.format(year,month,days))
     #某年某月某日是星期几
     #day = get_start_day(year,month,date)
     #print('{}年{}月{}日是星期{}'.format(year,month,date,day))
     #打印日历
     print_calendar(year,month,date)

 #执行
 main()