Dictionary could be copied to another dictionary using which of following syntax?

I am trying to create a python dictionary that has a collection of keys with multiple values per key. I want to be able to add values to an existing key in the dictionary. I have reviewed multiple threads on this but I have not found one that applies directly. Here is format of the key if key in dictionary: dictionary[key].append(message1) else: dictionary[key] =message1 The plan is to write the dictionary to a json file later. The problem is that I keep getting this error, which I'm not sure how to solve: 'dict' object has no attribute 'append' How could I fix the error and what is the best way to implement adding new value to existing key? TL;DR: You can append a value to a Python list (or array), but not to a dictionary. Add key: value pair to dictionary The syntax dictionary[key] = message1 changes the existing value of dictionary[key] to message if the key is already in the dictionary, and creates a key-value pair key: message1 if the key is not yet in the dictionary. So instead of this... if key in dictionary: dictionary[key].append(message1) else: dictionary[key] = message1 ...you would use this: dictionary[key] = message1 Update dictionary with different key: value pairs If you want to update a dictionary with the values from another dictionary, you can do it this way: dictionary_1.update(dictionary_2) This modifies dictionary_1 in place, using the values for each key in dictionary_2. If a key does not exist in dictionary_1, but exists in dictionary_2, then update...

In this article Short description Describes how to create, use, and sort hashtables in PowerShell. Long description A hashtable, also known as a dictionary or associative array, is a compact data structure that stores one or more key-value pairs. For example, a hash table might contain a series of IP addresses and computer names, where the IP addresses are the keys and the computer names are the values, or vice versa. In PowerShell, each hashtable is a Hashtable [System.Collections.Hashtable] object. You can use the properties and methods of Hashtable objects in PowerShell. Beginning in PowerShell 3.0, you can use the [ordered] attribute to create an [System.Collections.Specialized.OrderedDictionary] object in PowerShell. Ordered dictionaries differ from hashtables in that the keys always appear in the order in which you list them. The order of keys in a hashtable isn't determined. The keys and value in hashtables are also .NET objects. They're most often strings or integers, but they can have any object type. You can also create nested hashtables, in which the value of a key is another hashtable. Hashtables are frequently used because they're efficient for finding and retrieving data. You can use hashtables to store lists and to create calculated properties in PowerShell. And, PowerShell has a cmdlet, ConvertFrom-StringData, that converts strings to a hashtable. Syntax The syntax of a hashtable is as follows: @ Note In these examples, $hash is defined as an Each example r...

copied_marks = original_marks.copy() print('Original Marks:', original_marks) print('Copied Marks:', copied_marks) # Output: Original Marks: new = original.copy() print('Orignal: ', original) print('New: ', new) Output Orignal: Dictionary copy() Method Vs = Operator When the copy() method is used, a new dictionary is created which is filled with a copy of the references from the original dictionary. new = original # removing all elements from the list new.clear() print('new: ', new) print('original: ', original) Output new: