Dictionary comprehensions
Last Updated: February 3, 2018 12:20 PM UTC
Last edited by:
Joseph <joseph@josephbanks.me>
Initial Commit
THIS IS FAKE DEMO DATA

Dictionary comprehensions (dict comps) provide a convenient way to make dictionaries, just like list comps: 

>>> {word.lower(): len(word) for word in ('I', 'love', 'Python')}
{'i': 1, 'love': 4, 'python': 6}
The syntax is very similar to list comps except that you surround it with curly braces and have two expressions: one for the key and one for the value.

One can use a dict comp to change an existing dictionary using its items method 

>>> first_dict = {'i': 1, 'love': 4, 'python': 6}
>>> {key.upper(): value * 2 for key, value in first_dict.items()}
{'I': 2, 'LOVE': 8, 'PYTHON': 12}
For more information and examples, check out PEP 274