How can I create Dynamic size Multidimensional array in python?
Aim is to create a dynamic size arrays within arrays, e.g.:
ExampleArray{
book1 : { key:val }
book2 : { key:val }
}
This returns an error:
ExampleArray = {}
ExampleArray['book1']['key'] = 'val';
Why?
replace by
ExampleArray = {}
ExampleArray['book1'] = {}
ExampleArray['book1']['key'] = 'val'
when you do ExampleArray['book1'] you are trying to access it but no to affect it, therefore since the key does not exists it throws an exception
you have to affect a value to ExampleArray['book1'] (in this case dict())
PS. loose the ; at the end of the lines. you are not doing C or C++
https://docs.python.org/3/library/collections.html#collections.defaultdict
from collections import defaultdict
ExampleArray = defaultdict(dict)
ExampleArray['book1']['key'] = 'val'
print(ExampleArray) # defaultdict(<class 'dict'>, {'book1': {'key': 'val'}})
