我有这个错误，我不知道该怎么办

Question

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 (isinstance(year/4, int)):
                        daysAmount = 29
                elif (month+1 == 12):
                    daysAmount = 31
                elif (isinstance((month+1)/2, int)):
                    daysAmount = 30
                else:
                    daysAmount = 31
                for day in range(daysAmount):
                    data[year].months[month].days.append({
                        'day': (day + 1),
                    })
        with open('./data.txt', 'w') as outfile:
            json.dump(data, outfile)
    
    
    
    Reset()

我更改了代码，但现在又出现了一个我不明白的错误。 我该怎么办？ 如您所见，它确实有一个属性months ...

line 13, in Reset
    data[year].months.append({
AttributeError: 'dict' object has no attribute 'months'

Answer 1

len() function 确实返回 integer。

for x in y:

y 这里必须是一个列表或迭代的东西而不是 integer

通过使用len(data)你只返回列表的长度

你应该使用

for year in data:

Answer 2

是的，有一种方法可以将数据列表中的项目数而不是实际对象放入“年份”变量中，为此您应该使用

for year in range(len(data)): 

如下

import json
import datetime
now = datetime.datetime.now()

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 (isinstance(year/4, int)):
                    daysAmount = 29
            elif (month+1 == 12):
                daysAmount = 31
            elif (isinstance((month+1)/2, int)):
                daysAmount = 30
            else:
                daysAmount = 31
            for day in range(daysAmount):
                data[year]['months'][month].days.append({
                    'day': (day + 1),
                })
    with open('./data.txt', 'w') as outfile:
        json.dump(data, outfile)



Reset()

另一种方法是使用

for year in data:

如下

import json
import datetime
now = datetime.datetime.now()

def Reset():
    data = []
    data.append({
        'year': now.year,
        'months': []
    })
    for year in data:
        for month in range(12):
            year['months'].append({
                'month': (month + 1),
                'days': []
            })
            if (month+1 == 2):
                daysAmount = 28
                if (isinstance(year/4, int)):
                    daysAmount = 29
            elif (month+1 == 12):
                daysAmount = 31
            elif (isinstance((month+1)/2, int)):
                daysAmount = 30
            else:
                daysAmount = 31
            for day in range(daysAmount):
                year['months'][month].days.append({
                    'day': (day + 1),
                })
    with open('./data.txt', 'w') as outfile:
        json.dump(data, outfile)

Reset()

Answer 3

当你做 len(data) 时，它返回一个不可迭代的 integer；

因此，您应该执行以下操作：

for year in range(len(data)) 

或者

for item in data.item:
     year = item['year'] 
     ...

Answer 4

您收到错误是因为您属于这一行

for year in len(data):

此 len(data) 返回 integer 并且不可迭代。

相反，您可以这样做

for item in data:
    year = item['year']

或者

for index in range(len(data)):
    item = data[index]