dict.fromkeys() method in Python

Thefromkeys() method of dicttype is used to create a new dictionary with keys from a given iterable and values pre-filled with a specified default value.

The syntax is as shown below:

dict.setdefault(iterable, value = None)

The items in the created dictionary has the elements from the iterableas keys and the specified valueas the default value. If valueis not given, Nonewill be used.

keys = [1, 2, 3, 4, 5]

d = dict.fromkeys(keys)
print(d)

If the default value is given, the item's values will be populated with the value instead of None.

keys = ['one', 'two', 'three', 'four', 'five']

d = dict.fromkeys(keys, 0)
print(d)

In the above example, we specified 0 as the default value to thefromkeys() method.

Note that the iterable argument can be any valid iterable not just lists. In the following example we use a range() for the iterable argument.

d = dict.fromkeys(range(5))
print(d)

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