Iterate over a dictionary in Python
David Y.
The Problem
How can I iterate over a dictionary using a Python for loop?
The Solution
The simplest way to iterate over a Python dictionary is to iterate over its keys. The following code will print each key in a dictionary with its corresponding value:
word_counts = {"the": 3, "a": 5, "be": 2, "do": 1} for key in word_counts: print(f"{key}: {word_counts[key]}")
While this works, we may prefer to iterate over keys and values at the same time. Python’s built-in dict class includes a method called items(), which returns a dictionary view object that can be used for exactly this purpose. Below, we’ve rewritten our code to use this method:
word_counts = {"the": 3, "a": 5, "be": 2, "do": 1} for key, value in word_counts.items(): print(f"{key}: {value}")
You can also use the enumerate() function to get the index and key-value in the iteration. This is useful if you need the position of the element in the dictionary along with the key-value pair:
word_counts = {"the": 3, "a": 5, "be": 2, "do": 1} for index, (key, value) in enumerate(word_counts.items()): print(f"{index} {key}:{value}")
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