# Merging Two Dictionaries in Python Dictionaries are an essential data type in Python, often used to store key-value pairs. As such, it is important to know how to properly merge two dictionaries together, especially when the same key exists in both dictionaries. In this article, we'll discuss how to merge two dictionaries in Python, using the built-in `update()` method, as well as using a loop and the `dict()` constructor. We'll go over examples of each approach, so you can choose the best one for your purposes. The `update()` method is a straightforward way to merge two dictionaries together. It allows you to take two existing dictionaries and merge them into one, combining the keys and values of both into a single dictionary. The keys in the resulting dictionary are the union of the keys from both dictionaries, with the values from the second dictionary overriding any duplicate keys from the first. Using a loop is another option for merging two dictionaries. It allows you to iterate through the keys and values of both dictionaries, and add the items to a new dictionary. This approach is useful if you want to apply some additional logic to the items before adding them to the new dictionary. Finally, you can also use the `dict()` constructor to merge two dictionaries together. The constructor takes in an iterable of tuples, each of which contains a key and a value. This approach is useful if you want to combine two existing dictionaries into a single dictionary, without having to manually loop through the items. In this article, we'll discuss each of these approaches in more detail, and provide examples of how to use them. We'll also discuss some potential pitfalls and best practices when merging two dictionaries in Python.

Algorithm: 1. Create two dictionaries, e.g. `dict1` and `dict2` 2. Create an empty dictionary `dict_merged` 3. Iterate through `dict1` and add its items to `dict_merged` 4. Iterate through `dict2` and add its items to `dict_merged` 5. Return `dict_merged` Sample Code: ```python # Create two dictionaries dict1 = { 'a': 1, 'b': 2 } dict2 = { 'c': 3, 'd': 4 } # Create an empty dictionary dict_merged = {} # Iterate through dict1 and add its items to dict_merged for k, v in dict1.items(): dict_merged[k] = v # Iterate through dict2 and add its items to dict_merged for k, v in dict2.items(): dict_merged[k] = v # Return merged dictionary return dict_merged ```