How to Merge Multiple Dictionaries into a Single Dictionary in Python?

Merging Multiple Dictionaries into a Single Dictionary

In the realm of Python programming, merging multiple dictionaries into a single cohesive dictionary can be a common task. One might encounter a scenario where a list of dictionaries, each containing specific key-value pairs, needs to be consolidated into a comprehensive dictionary.

To achieve this, the following approaches can be employed:

Using a Loop:

One straightforward method involves utilizing a loop to iteratively incorporate the contents of each dictionary in the list into a result dictionary. This method maintains a cumulative effect, wherein the keys from all input dictionaries are merged, and their corresponding values are updated or overridden.

result = {}
for d in L:
    result.update(d)

Using a Comprehension (Python >=2.7):

Python's comprehensions offer a more concise syntax for merging dictionaries. By utilizing a series of nested loops and dictionary comprehensions, one can create a dictionary that combines the keys and values from all the input dictionaries:

{k: v for d in L for k, v in d.items()}

Using a Comprehension (Python <2.7):

For Python versions prior to 2.7, a similar effect can be achieved using the following code:

dict(pair for d in L for pair in d.items())

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