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When using Python is it possible that a dict can have a value that is a list?
for example, a dictionary that would look like the following (see KeyName3's values):
{
keyName1 : value1,
keyName2: value2,
keyName3: {val1, val2, val3}
}
I already know that I can use 'defaultdict' however single values are (understandably) returned as a list.
The reason I ask is that my code must be generic so that the caller can retieve single key values as an item (just like from a dict key-value) and not as list (without having to specify pop[0] the list) - however also retrieve multiple values as a list.
If not then any suugestions would be welcome.
If someone can help then that would be great.
Thanks in Advance,
Paul
*I'm using Python 2.6 however writing scripts that must also be forward compatible with Python 3.0+.
297
Here the default dict() method is used to iterate over a list of tuples. In this example, we have inserted a list as a value in the dictionary by applying the method subscript. In a Python dictionary, the subscript method can be added to an existing value and can be modified to a Python dictionary.
A dictionary or a list cannot be a key. Values, on the other hand, can literally be anything and they can be used more than once.
Let's see all the different ways we can create a dictionary of Lists. Method #2: Adding nested list as value using append() method. Create a new list and we can simply append that list to the value. Iterate the list and keep appending the elements till given range using setdefault() method.
Yes. The values in a dict can be any kind of python object. The keys can be any hashable object (which does not allow a list, but does allow a tuple).
You need to use [], not {} to create a list:
{ keyName1 : value1, keyName2: value2, keyName3: [val1, val2, val3] }
Yes, it's possible:
d = {}
d["list key"] = [1,2,3]
print d
output:
{'list key': [1, 2, 3]}
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