我的陈述不起作用，我不知道为什么[重复]答案

【问题标题】：My statements aren't working and I don't know why [duplicate]我的陈述不起作用，我不知道为什么[重复]
【发布时间】：2021-04-09 00:13:25
【问题描述】：

我将我的代码编辑到现在可以工作的程度：

def Reset():
data = []
data.append({
    'year': now.year,
    'months': []
})
for year in range(len(data)):
    for month in range(12):
        data[year]['months'].append({
            'month': (month + 1),
            'days': []
        })
        if (month+1 == 2):
            daysAmount = 28
            if (is_leap_year(now.year)):
                daysAmount = 29
        elif ((month+1) == 12):
            daysAmount = 31
        elif ((month+1)%2 == 0):
            daysAmount = 30
        else:
            daysAmount = 31
        for day in range(daysAmount):
            data[year]['months'][month]['days'].append({
                'day': (day + 1),
            })
with open('data.json', 'w') as outfile:
    json.dump(data, outfile)

重置() 这是我让它工作后的输出：

[{"year": 2021, "months": [{"month": 1, "days": [{"day": 1}, {"day": 2}, {"day": 3}, {"day": 4}, {"day": 5}, {"day": 6}, {"day": 7}, {"day": 8}, {"day": 9}, {"day": 10}, {"day": 11}, {"day": 12}, {"day": 13}, {"day": 14}, {"day": 15}, {"day": 16}, {"day": 17}, {"day": 18}, {"day": 19}, {"day": 20}, {"day": 21}, {"day": 22}, {"day": 23}, {"day": 24}, {"day": 25}, {"day": 26}, {"day": 27}, {"day": 28}, {"day": 29}, {"day": 30}, {"day": 31}]}, {"month": 2, "days": [{"day": 1}, {"day": 2}, {"day": 3}, {"day": 4}, {"day": 5}, {"day": 6}, {"day": 7}, {"day": 8}, {"day": 9}, {"day": 10}, {"day": 11}, {"day": 12}, {"day": 13}, {"day": 14}, {"day": 15}, {"day": 16}, {"day": 17}, {"day": 18}, {"day": 19}, {"day": 20}, {"day": 21}, {"day": 22}, {"day": 23}, {"day": 24}, {"day": 25}, {"day": 26}, {"day": 27}, {"day": 28}]}, {"month": 3, "days": [{"day": 1}, {"day": 2}, {"day": 3}, {"day": 4}, {"day": 5}, {"day": 6}, {"day": 7}, {"day": 8}, {"day": 9}, {"day": 10}, {"day": 11}, {"day": 12}, {"day": 13}, {"day": 14}, {"day": 15}, {"day": 16}, {"day": 17}, {"day": 18}, {"day": 19}, {"day": 20}, {"day": 21}, {"day": 22}, {"day": 23}, {"day": 24}, {"day": 25}, {"day": 26}, {"day": 27}, {"day": 28}, {"day": 29}, {"day": 30}, {"day": 31}]}, {"month": 4, "days": [{"day": 1}, {"day": 2}, {"day": 3}, {"day": 4}, {"day": 5}, {"day": 6}, {"day": 7}, {"day": 8}, {"day": 9}, {"day": 10}, {"day": 11}, {"day": 12}, {"day": 13}, {"day": 14}, {"day": 15}, {"day": 16}, {"day": 17}, {"day": 18}, {"day": 19}, {"day": 20}, {"day": 21}, {"day": 22}, {"day": 23}, {"day": 24}, {"day": 25}, {"day": 26}, {"day": 27}, {"day": 28}, {"day": 29}, {"day": 30}]}, {"month": 5, "days": [{"day": 1}, {"day": 2}, {"day": 3}, {"day": 4}, {"day": 5}, {"day": 6}, {"day": 7}, {"day": 8}, {"day": 9}, {"day": 10}, {"day": 11}, {"day": 12}, {"day": 13}, {"day": 14}, {"day": 15}, {"day": 16}, {"day": 17}, {"day": 18}, {"day": 19}, {"day": 20}, {"day": 21}, {"day": 22}, {"day": 23}, {"day": 24}, {"day": 25}, {"day": 26}, {"day": 27}, {"day": 28}, {"day": 29}, {"day": 30}, {"day": 31}]}, {"month": 6, "days": [{"day": 1}, {"day": 2}, {"day": 3}, {"day": 4}, {"day": 5}, {"day": 6}, {"day": 7}, {"day": 8}, {"day": 9}, {"day": 10}, {"day": 11}, {"day": 12}, {"day": 13}, {"day": 14}, {"day": 15}, {"day": 16}, {"day": 17}, {"day": 18}, {"day": 19}, {"day": 20}, {"day": 21}, {"day": 22}, {"day": 23}, {"day": 24}, {"day": 25}, {"day": 26}, {"day": 27}, {"day": 28}, {"day": 29}, {"day": 30}]}, {"month": 7, "days": [{"day": 1}, {"day": 2}, {"day": 3}, {"day": 4}, {"day": 5}, {"day": 6}, {"day": 7}, {"day": 8}, {"day": 9}, {"day": 10}, {"day": 11}, {"day": 12}, {"day": 13}, {"day": 14}, {"day": 15}, {"day": 16}, {"day": 17}, {"day": 18}, {"day": 19}, {"day": 20}, {"day": 21}, {"day": 22}, {"day": 23}, {"day": 24}, {"day": 25}, {"day": 26}, {"day": 27}, {"day": 28}, {"day": 29}, {"day": 30}, {"day": 31}]}, {"month": 8, "days": [{"day": 1}, {"day": 2}, {"day": 3}, {"day": 4}, {"day": 5}, {"day": 6}, {"day": 7}, {"day": 8}, {"day": 9}, {"day": 10}, {"day": 11}, {"day": 12}, {"day": 13}, {"day": 14}, {"day": 15}, {"day": 16}, {"day": 17}, {"day": 18}, {"day": 19}, {"day": 20}, {"day": 21}, {"day": 22}, {"day": 23}, {"day": 24}, {"day": 25}, {"day": 26}, {"day": 27}, {"day": 28}, {"day": 29}, {"day": 30}]}, {"month": 9, "days": [{"day": 1}, {"day": 2}, {"day": 3}, {"day": 4}, {"day": 5}, {"day": 6}, {"day": 7}, {"day": 8}, {"day": 9}, {"day": 10}, {"day": 11}, {"day": 12}, {"day": 13}, {"day": 14}, {"day": 15}, {"day": 16}, {"day": 17}, {"day": 18}, {"day": 19}, {"day": 20}, {"day": 21}, {"day": 22}, {"day": 23}, {"day": 24}, {"day": 25}, {"day": 26}, {"day": 27}, {"day": 28}, {"day": 29}, {"day": 30}, {"day": 31}]}, {"month": 10, "days": [{"day": 1}, {"day": 2}, {"day": 3}, {"day": 4}, {"day": 5}, {"day": 6}, {"day": 7}, {"day": 8}, {"day": 9}, {"day": 10}, {"day": 11}, {"day": 12}, {"day": 13}, {"day": 14}, {"day": 15}, {"day": 16}, {"day": 17}, {"day": 18}, {"day": 19}, {"day": 20}, {"day": 21}, {"day": 22}, {"day": 23}, {"day": 24}, {"day": 25}, {"day": 26}, {"day": 27}, {"day": 28}, {"day": 29}, {"day": 30}]}, {"month": 11, "days": [{"day": 1}, {"day": 2}, {"day": 3}, {"day": 4}, {"day": 5}, {"day": 6}, {"day": 7}, {"day": 8}, {"day": 9}, {"day": 10}, {"day": 11}, {"day": 12}, {"day": 13}, {"day": 14}, {"day": 15}, {"day": 16}, {"day": 17}, {"day": 18}, {"day": 19}, {"day": 20}, {"day": 21}, {"day": 22}, {"day": 23}, {"day": 24}, {"day": 25}, {"day": 26}, {"day": 27}, {"day": 28}, {"day": 29}, {"day": 30}, {"day": 31}]}, {"month": 12, "days": [{"day": 1}, {"day": 2}, {"day": 3}, {"day": 4}, {"day": 5}, {"day": 6}, {"day": 7}, {"day": 8}, {"day": 9}, {"day": 10}, {"day": 11}, {"day": 12}, {"day": 13}, {"day": 14}, {"day": 15}, {"day": 16}, {"day": 17}, {"day": 18}, {"day": 19}, {"day": 20}, {"day": 21}, {"day": 22}, {"day": 23}, {"day": 24}, {"day": 25}, {"day": 26}, {"day": 27}, {"day": 28}, {"day": 29}, {"day": 30}, {"day": 31}]}]}]

选中的答案解决了我的问题。

【问题讨论】：

type((month+1)/2) 将始终为float，即使它类似于1.0。请改用(month+1)/2).is_integer()。
此外，即使您确实想检查类型，isinstance() 通常也是一种更好的方法。最后，您应该考虑是否可以使用datetime 模块的功能来完成此任务；正确实现您自己的日期处理代码很棘手。
您能否更具体地了解您的问题？您的问题是模数是检查数字是偶数还是奇数的唯一选项，还是关于您的代码的另一个问题？第一种情况不需要代码，最后一种情况请贴出当前输出并指出哪里出了问题
我会注意到，即使您正确实施它，您的偶数/奇数检查的基本逻辑对于计算月份的长度也是不正确的。有 7 个 31 天的月份和 4 个 30 天的月份（以及 2 月，它自己做事）。您当前的逻辑，即使它有效，仍然会在 8 月至 11 月出错。
8 月现在是正确的，我将更新我的代码。检查的答案修复了它。

标签： python

【解决方案1】：

这段代码有多个错误。

闰年检查不正确。这是一个检查闰年的功能：

def is_leap_year(year: int) -> bool:
    """Determine whether a year is a leap year."""
    
    return year % 4 == 0 and (year % 100 != 0 or year % 400 == 0)

is_leap_year(2020)  # True
is_leap_year(2022)  # False

这应该是elif:

if ((month+1) == 12):

偶/奇校验不正确。您可以使用%（模运算符）。

if (month + 1) % 2 == 0:  # even
if (month + 1) % 2 != 0:  # odd

【讨论】：

好的，我会使用那个函数！
@LarsLagauw 很高兴它对您有所帮助！

【解决方案2】：

您检测偶数月份的方法是错误的。您希望 4/2 的类型为 int，但事实并非如此。

type((3+1)/2)
<class 'float'>

无论如何按类型检测偶数/奇数是非常错误的。

您应该改用模运算符%

if ((month+1) == 12):
     daysAmount = 31
elif ((month+1)%2) == 0):
     daysAmount = 30
else:
     daysAmount = 31

【讨论】：

好的，30 天和 31 天的区别现在有效，但 2 月仍然无效。我在这里也应用了同样的东西：if (month+1 == 2): daysAmount = 28 if (year%4 == 0): daysAmount = 29