![]() ![]() Using the `chain()` method is a simple and efficient way to merge two or more dictionaries in Python. We print out this dictionary using the `print()` function and get the following output:Īs you can see, the resulting dictionary contains all key-value pairs from both original dictionaries. We then pass these lists as arguments to the `chain()` method along with their respective dictionaries.įinally, we convert the merged iterable into a dictionary using the built-in `dict()` function and assign it to a new variable called `merged_dict`. To merge these two dictionaries using the `chain()` method, we call the `items()` method on each dictionary to get a list of key-value pairs for each dictionary. We then define two dictionaries, `dict1` and `dict2`, that we want to merge. In this example, we first import the `chain()` method from the `itertools` module. Here’s an example of how to use the update() method to merge two dictionaries:ĭict1 = merged_dict = dict ( chain ( dict1. The keys in the second dictionary will overwrite the keys in the first dictionary if they have the same name. This method takes one argument which is the dictionary to be merged with the original one. The update() method is a built-in function in Python that updates one dictionary with the key-value pairs from another dictionary. Luckily, Python provides a simple and easy way to merge dictionaries using the update() method. In some cases, you may need to merge two or more dictionaries into a single dictionary. In Python, dictionaries are an important data structure that allows you to store key-value pairs. Merging Dictionaries using the update() method Merging Dictionaries using the chain() method from itertools module.Merging Dictionaries using the ** unpacking operator.Merging Dictionaries using the update() method.In this tutorial, we will explore different methods of merging dictionaries in Python. Merging dictionaries involves combining the key-value pairs of two or more dictionaries into a single dictionary. Sometimes, it may be necessary to merge two or more dictionaries in Python. Below is the output On average, it took 3.In Python programming, a dictionary is a collection of key-value pairs that are unordered, changeable, and indexed. Below is the output On average, it took 5.5255000000000026e-05 seconds Using the |= operatorĪlong with the | operator, the |= operator was introduced in Python 3.9. In Python 3.9, the pipe operator was introduced to combine dictionaries. The original dictionaries are not updated.īelow is the output On average, it took 7.01560299967241e-05 seconds Using the | operator ![]() ![]() In this approach as well, we create a new dictionary. Below is the output On average, it took 9.942399992723949e-07 seconds Using the unpacking operator Unlike the previous two approaches, a new dictionary is created and the original dictionaries are not updated. On average, it took 2.554959000008239e-05 seconds Using the ChainMap Function If there is a common key present, the value for the key in the first dictionary will be overwritten by that of the second dictionary. The elements of the second dictionary are added to the first dictionary. Similar to the for loop approach, the first dictionary is updated. We simply iterate over the second dictionary and add its elements to the first dictionary.īelow is the output On average, it took 6.765522999558016e-05 seconds Using the update method ![]() The function will be called 100 times and we will print the average run time. We will update function func to perform the different combination methods. We have a couple of dictionaries with 1000 key-value pairs in each dictionary. Using the (|=) operator How are we going to measure the performance?.We will be considering the following ways Today we will try to find the fastest way to combine dictionaries We know the fastest way to combine lists. ![]()
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