How to convert dictionary list to custom objects in Python

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I have a list which has some dictionaries to be bulk uploaded. I need to check if elements of list can be cast to a custom object(as below). Is there any elegant way to do it like type comparison?

This is my model

class CheckModel(object):

    def __init__(self,SerialNumber,UID, Guid = None,Date = None):
        self.SerialNumber = SerialNumber
        self.UID = UID
        self.Guid = str(uuid.uuid4()) if Guid is None else Guid
        self.Date = datetime.now().isoformat() if Date is None else Date

And this is my test data. How can I cast only first element(because first element is the only correct one.) of this list into CheckModel object?

test = [{
        "Guid":"d0c035a7-0e01-4a37-8fe9-251fb5633fc9",
        "SerialNumber":"1716154A",
        "UID":"F13BDB3B",
        "Date":"2019-12-03T13:50:19.882Z"

    },
    {
        "Guid":"d0585-0e01-4a47-8fe9-251245f33fc9",
        "SerialNumber":"1716154A",
        "Date":"2019-12-03T13:50:19.882Z"
    },
    {
        "Guid":"12414a7-0e01-4a47-8fe9-251245f33fc9",
        "SerialNumber":"1716154A",
        "UID":"F13BDB3B",
        "Date":"2019-12-03"
    }]

You can create a custom cleanup function and then use filter

Ex:

import datetime
import uuid

class CheckModel(object):

    def __init__(self,SerialNumber,UID, Guid = None,Date = None):
        self.SerialNumber = SerialNumber
        self.UID = UID
        self.Guid = str(uuid.uuid4()) if Guid is None else Guid
        self.Date = datetime.datetime.now().isoformat() if Date is None else Date

#Clean Up Function.             
def clean_data(data):
    if all(key in data for key in ("Guid", "SerialNumber", "UID", "Date")):
        try:
            datetime.datetime.strptime(data["Date"], "%Y-%m-%dT%H:%M:%S.%fZ")
            return True
        except:
            pass
    return False 


test = [{
        "Guid":"d0c035a7-0e01-4a37-8fe9-251fb5633fc9",
        "SerialNumber":"1716154A",
        "UID":"F13BDB3B",
        "Date":"2019-12-03T13:50:19.882Z"

    },
    {
        "Guid":"d0585-0e01-4a47-8fe9-251245f33fc9",
        "SerialNumber":"1716154A",
        "Date":"2019-12-03T13:50:19.882Z"
    },
    {
        "Guid":"12414a7-0e01-4a47-8fe9-251245f33fc9",
        "SerialNumber":"1716154A",
        "UID":"F13BDB3B",
        "Date":"2019-12-03"
    }]

model_data = [CheckModel(**data) for data in filter(clean_data, test)]
print(model_data)

Output:

[<__main__.CheckModel object at 0x0000000002F0AFD0>]

Convert nested Python dictionary to object, Let us see how to convert a given nested dictionary into an object We can solve this particular problem by importing the json module and use a custom object hook in the json.loads() method. instance of class list. Let us see how to convert a given nested dictionary into an object. Method 1 : Using the json module. We can solve this particular problem by importing the json module and use a custom object hook in the json.loads() method.

As you already have an initializer for the CheckModel class you should be able to just pass the values from the dict to this function:

check_model = CheckModel(test[0]['SerialNumber'], test[0]['UID'], test[0]['Guid'], test[0]['Date'])

Using dictionaries to store data as key-value pairs, The Python list stores a collection of objects in an ordered sequence. when manually creating dictionary objects and converting real-world data into dictionary� In this tutorial, we will learn how to convert a dictionary into a list in Python with three different methods. A Dictionary is an unordered sequence that is mutable. Certainly, it is used for more flexible operations.

If you just want the first one, you can use **kwargs to unpack a dictionary as a mapping into your __init__

some_object = CheckModel(**test[0])

However, this will only work if all of the keys are available as arguments of the function. This will raise an exception if you try this with test[1], since the UID arg will be missing

Python object and dictionary convertion �, Python object and dictionary convertion. Jun 14 Convert from class to dictionary In contrast, if you want to convert a dictionary to object, use this method. of the Struct class to allow handling of nested dicts in lists/arrays. Given a list, write a Python program to convert the given list to dictionary such that all the odd elements have the key, and even number elements have the value. Since python dictionary is unordered, the output can be in any order.

Use **kwargs to pass the dictionary as an argument to the constructor, which will unpack the dictionary as a list of argument

In addition, I would suggest making UID=None since UID was missing in one of the dictionaries of the list. Below will parse all elements of list into the Class

import datetime as datetime

class CheckModel(object):

    #Made UID None since it is not present in one of the dictionaries
    def __init__(self,SerialNumber,UID=None, Guid = None,Date = None):
        self.SerialNumber = SerialNumber
        self.UID = UID
        self.Guid = str(uuid.uuid4()) if Guid is None else Guid
        self.Date = datetime.now().isoformat() if Date is None else Date

test = [{
        "Guid":"d0c035a7-0e01-4a37-8fe9-251fb5633fc9",
        "SerialNumber":"1716154A",
        "UID":"F13BDB3B",
        "Date":"2019-12-03T13:50:19.882Z"

    },
    {
        "Guid":"d0585-0e01-4a47-8fe9-251245f33fc9",
        "SerialNumber":"1716154A",
        "Date":"2019-12-03T13:50:19.882Z"
    },
    {
        "Guid":"12414a7-0e01-4a47-8fe9-251245f33fc9",
        "SerialNumber":"1716154A",
        "UID":"F13BDB3B",
        "Date":"2019-12-03"
    }]

models = []

for item in test:
    #Use **kwargs to pass dictionary as arguments to constructor
    models.append(CheckModel(**item))
print(models)

To just create the object of first item in the list, do

CheckModel(**test[0])

dict_from_class() — Objects and classes in Python tutorial, Here, once again, is the list of entries. >>> sorted(A.__dict__. Following conversions from list to dictionary will be covered here, Convert a List to Dictionary with same values; Convert List items as keys in dictionary with enumerated value; Convert two lists to dictionary; Convert a list of tuples to dictionary; Convert a List to Dictionary with same values. Suppose we have a list of strings i.e.

This should give you access to the first element of the list and then you can parse out the dictionary as necessary.

elem = check_model[0]

# Use the get() function on a dictionary to get the value of key without 
# breaking the code if the key doesn't exist
guid = elem.get('Guid')
serial_number = elem.get('SerialNumber')
uid = elem.get('UID')
date = elem.get('Date')

instance = CheckModel(serial_number, uid, Guid=guid, Date=date)

# Do something with it
instance.do_something()

How to convert a dictionary to a list in Python, Originally Answered: How do I convert a list into a dictionary in python? They produce Python dictionary objects, they create a new dictionary. you can't use them Nabarun Mondal, Created 4 custom languages - ZoomBA is open sourced. A list of lists is a valid python list, and a much better interpretation of a "dictionary" than a flat list containing only non-list values. A list of lists is at least capable of showing keys and values still grouped together. – codetaku Nov 19 '14 at 16:42

Python’s dictionaries are great for creating ad-hoc structures of arbitrary number of items. Sometimes, though, it can be awkward using the dictionary syntax for setting and getting the items. For example, let’s say you have the following data structures:

Method #1 : Naive Method The basic method that can be applied to perform this task is the brute force method to achieve this. For this, simply declare a dictionary, and then run nested loop for both the lists and assign key and value pairs to from list values to dictionary.

Next, we'll need the code that can be used to execute the conversion of the values from the dictionary to a list, like this: food_list=list (data.values ()) print (food_list)