Ruby学习笔记（4）－闰年、季节和月份天数的Ruby版和Python版

            这是一个我在Delphi、C#和VB.NET教学中经常让学生做的一个例子：输入年份和月份，判断该年是否是闰年；判断该月属于什么季节；该月有多少天。练习对语言的特性的掌握，诸如流程控制、数据类型、输入输出、函数等等。下面是这个问题的Python和Ruby版本。
            Python：

import  sys
def  IsLeapYear(y):
     if  ((y  %   4 == 0) and (y  %   100 != 0)) or (y  %   400 == 0):
         return  True
     else :
         return  False

def  Season(m):
     if  m  in  [ 12 , 1 , 2 ]:
         return   " winter "
     elif  m  in  [ 3 , 4 , 5 ]:
         return   " spring "
     elif  m  in  [ 6 , 7 , 8 ]:
         return   " summer "
     elif  m  in  [ 9 , 10 , 11 ]:
         return   " autumn "
     else :
         return   " error "
        
def  Days(y,m):
     if  m  in  [ 1 , 3 , 5 , 7 , 8 , 10 , 12 ]:
         return   31
     if  m  in  [ 4 , 6 , 9 , 11 ]:
         return   30
     if  m == 2 :
         if  IsLeapYear(y) == True:
             return   29
         else :
             return   28


print   " Please input year: "
year = int(sys.stdin.readline(), 10 )
print   " Please input month: "
month = int(sys.stdin.readline(), 10 )
if  IsLeapYear(year) == True:
     print   " This is Leap year!\n "
else :
     print   " This is not Leap year!\n "
print   " %d is in %s\n "   % (month,Season(month))
print   " %d has %d days\n "   % (month,Days(year,month))
sys.stdin.readline()

            Ruby：

# LeapYear,Season,DaysOfMonth

def  IsLeapYear(y)
     if  ((y  %   4 == 0) and (y  %   100 != 0)) or (y  %   400 == 0)
         1
     else
        0
    end
end

def  Season(m)
    case m
        when  12 , 1 , 2
             " winter "
        when  3 , 4 , 5
             " spring "
        when  6 , 7 , 8
             " summer "
        when  9 , 10 , 11
             " autumn "
         else
             " error "
    end
end
        
def  Days(y,m)
    case m
        when  1 , 3 , 5 , 7 , 8 , 10 , 12
             31
        when  4 , 6 , 9 , 11
             30
        when  2
             if  IsLeapYear(y) == 1
                 29
             else
                 28
            end
    end
end

print   " Please input year: "
year = readline.to_i
print   " Please input month: "
month = readline.to_i

if  IsLeapYear(year) == 1
     print   " This is Leap year!\n "
else
     print   " This is not Leap year!\n "
end

print   " #{month} is in #{Season(month)}\n "
print   " #{month} has #{Days(year,month)} days\n "  
readline()