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I was wondering if there was a way to initialize a dictionary in python with keys but no corresponding values until I set them. Such as:
Definition = {'apple': , 'ball': } and then later i can set them:
Definition[key] = something I only want to initialize keys but I don't know the corresponding values until I have to set them later. Basically I know what keys I want to add the values as they are found. Thanks.
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In Python to create an empty dictionary with keys, we can use the combination of zip() and len() method. This method will initialize a dictionary of keys and returns no values in the dictionary.
There is no such thing as a key without a value in a dict. You can just set the value to None, though.
Yes, sets : set() -> new empty set object set(iterable) -> new set object Build an unordered collection of unique elements. Related: How is set() implemented? Show activity on this post.
In Python, we can use the zip() and len() methods to create an empty dictionary with keys. This method creates a dictionary of keys but returns no values from the dictionary.
Use the fromkeys function to initialize a dictionary with any default value. In your case, you will initialize with None since you don't have a default value in mind.
empty_dict = dict.fromkeys(['apple','ball']) this will initialize empty_dict as:
empty_dict = {'apple': None, 'ball': None} As an alternative, if you wanted to initialize the dictionary with some default value other than None, you can do:
default_value = 'xyz' nonempty_dict = dict.fromkeys(['apple','ball'],default_value) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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