I have this error and I don't know what to do

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()

I changed the code, but now another error came I don't understand. What should I do about this one? As you can see it does have an attribute months...

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

Answer 1

The len() function does return an integer.

for x in y:

y here must be a list or something iterative not an integer

by using len(data) your just returning the length of list

you should use

for year in data:

Answer 2

Yes, there is a way to get the number of items in the data list instead of the actual objects into the 'year' variable and for that you should use

for year in range(len(data)): 

as follows

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()

The other way would be to use

for year in data:

as follows

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

when u do len(data), it returns an integer which is not iterable;

hence you should do something like:

for year in range(len(data)) 

or

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

Answer 4

You are getting an error because you of this line

for year in len(data):

This len(data) returns integer and that is not iterable.

Instead you can do this

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

or

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