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Bookmark or Share- Is there a dictionary functionality in R - Stack OverflowI know three R packages for dictionaries: hash, hashmap, and dict. Update July 2018: a new one, container. Update September 2018: a new one, collections. hash. Keys must be character strings. A value can be any R object.
- How to concatenate two dictionaries to create a new one?Here's a one-liner (imports don't count :) that can easily be generalized to concatenate N dictionaries:Python 3
- How to sort a list of dictionaries by a value of the dictionary in ...If you do not need the original list of dictionaries, you could modify it in-place with sort() method using a custom key function. Key function: def get_name(d): """ Return the value of a key in a dictionary. """ return d["name"] The list to be sorted: data_one = [{'name': 'Homer', 'age': 39}, {'name': 'Bart', 'age': 10}] Sorting it in-place:
- Iterating over dictionaries using 'for' loops - Stack OverflowIt's not that key is a special word, but that dictionaries implement the iterator protocol. You could do this in your class, e.g. see this question for how to build class iterators. In the case of dictionaries, it's implemented at the C level. The details are available in PEP 234. In particular, the section titled "Dictionary Iterators":
- Quick Way to Implement Dictionary in C - Stack OverflowSection 6.6 of The C Programming Language presents a simple dictionary (hashtable) data structure. I don't think a useful dictionary implementation could get any simpler than this.
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