Python闰年练习，看起来正确除了jan-feb日期范围

Question

def daysBetweenDates(year1, month1, day1, year2, month2, day2):
    daysOfMonths = [ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
    daysOfMonthsleap = [ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
    years = [year1]
    x = year1 + 1
    leapMonthsStart = 0
    leapDaysStart = 0
    leapMonthsEnd = 0
    leapDaysEnd = 0
    yearMonthsStart = 0
    yearDaysStart = 0
    yearMonthsEnd = 0
    yearDaysEnd = 0

    if year1 == year2:
        years = [year1]
    else:
        while x <= year2:
            years.append(x)
            x = x + 1

    def isLeapYear(n):
        if n % 400 == 0:
            return True
        elif n % 100 == 0:
            return False
        elif n % 4 == 0:
            return True
        else:
            return False

    for i, year in enumerate(years):
           if isLeapYear(year):
               if years[i] == year1:
                    leapMonthsStart = sum(daysOfMonthsleap[0:month1])
                    leapDaysStart = day1
               if years[i] == year2:
                    leapMonthsEnd = sum(daysOfMonthsleap[month2:12])
                    leapDaysEnd = day2
                    # print 'leap:', day2
               years[i] = 366
           else:
               if years[i] == year1:
                    yearMonthsStart = sum(daysOfMonths[0:month1])
                    yearDaysStart = day1
               if years[i] == year2:
                    yearMonthsEnd = sum(daysOfMonths[month2:12])
                    yearDaysEnd = day2
               years[i] = 365

    yearsDaysTotal = sum(years)
    minusMonths =  leapMonthsStart + yearMonthsStart + leapMonthsEnd + yearMonthsEnd
    addDays = - yearDaysStart - leapDaysStart + leapDaysEnd + yearDaysEnd
    answer = yearsDaysTotal - minusMonths + addDays

    print 'months:', leapMonthsStart, leapMonthsEnd
    print 'days:', leapDaysStart, leapDaysEnd
    print 'answer:', answer, 'adding days:', addDays
    #print yearMonthsStart, yearMonthsEnd
    #print yearDaysStart, yearDaysEnd
    #return answer
        # 31, 28, 31, 30, 31, 30, 
        #                         31, 31, 30, 31, 30, 31
daysBetweenDates(2012,1,1,2012,2,28)

我一直在考虑这个问题好几个小时，但仍然无法理解我哪里出错了。我的代码适用于这些测试用例：daysBetweenDates(2011,6,30,2012,6,30)，daysBetweenDates(2012,1,1,2012,3,1)或daysBetweenDates(1900,1,1,1999,12,31)。

日期(2012,1,1,2012,2,28)是否需要特殊条件？ 31-1 + 28 = 58，我得到56

编辑：我决定在2月份添加特殊条件

if month2 == 2:
        answer = yearsDaysTotal - minusMonths + addDays + 2
        if month1 == 2:
            answer = answer - 2

分别为2012,1,1,2012,2,28和2012,2,1,2012,2,28

以下是完整版：

def daysBetweenDates(year1, month1, day1, year2, month2, day2):
    daysOfMonths = [ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
    daysOfMonthsleap = [ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
    years = [year1]
    x = year1 + 1
    leapMonthsStart = 0
    leapDaysStart = 0
    leapMonthsEnd = 0
    leapDaysEnd = 0
    yearMonthsStart = 0
    yearDaysStart = 0
    yearMonthsEnd = 0
    yearDaysEnd = 0

    if year1 == year2:
        years = [year1]
    else:
        while x <= year2:
            years.append(x)
            x = x + 1

    def isLeapYear(n):
        if n % 400 == 0:
            return True
        elif n % 100 == 0:
            return False
        elif n % 4 == 0:
            return True
        else:
            return False

    for i, year in enumerate(years):
           if isLeapYear(year):
               if years[i] == year1:
                    leapMonthsStart = sum(daysOfMonthsleap[0:month1])
                    leapDaysStart = day1
               if years[i] == year2:
                    leapMonthsEnd = sum(daysOfMonthsleap[month2:12])
                    leapDaysEnd = day2
                    # print 'leap:', day2
               years[i] = 366
           else:
               if years[i] == year1:
                    yearMonthsStart = sum(daysOfMonths[0:month1])
                    yearDaysStart = day1
               if years[i] == year2:
                    yearMonthsEnd = sum(daysOfMonths[month2:12])
                    yearDaysEnd = day2
               years[i] = 365

    yearsDaysTotal = sum(years)
    minusMonths =  leapMonthsStart + yearMonthsStart + leapMonthsEnd + yearMonthsEnd
    addDays = - yearDaysStart - leapDaysStart + leapDaysEnd + yearDaysEnd

    if month2 == 2:
        answer = yearsDaysTotal - minusMonths + addDays + 2
        if month1 == 2:
            answer = answer - 2
    else:
        answer = yearsDaysTotal - minusMonths + addDays

    print 'months:', leapMonthsStart, leapMonthsEnd
    print 'days:', leapDaysStart, leapDaysEnd
    print 'answer:', answer, 'adding days:', addDays
    #print yearMonthsStart, yearMonthsEnd
    #print yearDaysStart, yearDaysEnd
    #return answer
        # 31, 28, 31, 30, 31, 30, 
        #                         31, 31, 30, 31, 30, 31
daysBetweenDates(2012,2,1,2012,2,28)