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Python fromkeys() function
The fromkeys() function in Python is used to create a dictionary using specified keys and values. For example:
k = ("one", "two", "three") v = 100 dOne = dict.fromkeys(k, v) print(dOne) dTwo = dict.fromkeys(k) print(dTwo)
The output will be:
{'one': 100, 'two': 100, 'three': 100}
{'one': None, 'two': None, 'three': None}
Python fromkeys() function syntax
The syntax of the fromkeys() function in Python is:
dict.fromkeys(keys, value)
where "keys" refers to an iterable that specifies the keys, whereas "value" refers to a value to set for all the keys.
Note: The first parameter (keys) is required, whereas the second parameter (value) is optional.
Python fromkeys() Function Example
Here is an example of the fromkeys() function in Python.
d = dict.fromkeys([12, 432, 45, 5, 6, 34]) print(d)
The output will be:
{12: None, 432: None, 45: None, 5: None, 6: None, 34: None}
Advantages of the fromkeys() function in Python
- Simplify Code: fromkeys() eliminates the need to loop to initialize a dictionary with default values. This simplifies code.
- Efficient: fromkeys() creates a new dictionary with pre-defined values, making it more efficient than loop-initializing a dictionary with default values. This helps with large dictionaries.
- Customizable: fromkeys() lets you set all dictionary keys' default values. You can personalize the dictionary.
Disadvantages of the fromkeys() function in Python
- Limited functionality: You can only set a single default value for each key in the dictionary using the fromkeys() function. As a result, it cannot be used to create dictionaries with various default values for various keys.
- Limited functionality: You can only set a single default value for each key in the dictionary using the fromkeys() function. As a result, it cannot be used to create dictionaries with various default values for various keys.
- Only a sequence of keys can be used when creating a dictionary with fromkeys(). This implies that you are unable to create a dictionary using a class or function as the keys instead of a standard data type.
- Fromkeys() is ineffective for building complex data structures that require more than just a straightforward default value. You will have to use different functions or write custom code to initialize more intricate data structures.
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