Python dict comprehension

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D = {0: 'A', 1: 'B', 2: 'C', 3: 'D', 4: 'E', 5: 'F'}
removeKeys = [0, 2, 5]

X = {k: D[k] for k in D.keys() - removeKeys}

print(X)
# Prints {1: 'B', 3: 'D', 4: 'E'}

What I have tried:

hi friend, i understand this dict comprehension: X = {k: D[k] for k in D.keys()

but please help me understand this: - removeKeys

Posted 12-Nov-22 20:31pm

Member 15829581

Updated 12-Nov-22 21:27pm

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OriginalGriff · Answer 1 · 2022-11-12T21:17:00

Solution 1

Start here: Python | Subtraction of dictionaries - GeeksforGeeks[^]

Posted 12-Nov-22 21:17pm

OriginalGriff

Richard MacCutchan · Answer 2 · 2022-11-12T21:27:00

Python

D = {0: 'A', 1: 'B', 2: 'C', 3: 'D', 4: 'E', 5: 'F'}
removeKeys = [0, 2, 5]

X = {k: D[k] for k in D.keys() - removeKeys}

The variable removeKeys is a simple List. The result of the call to D.keys() is ~~another List~~ actually a view of the dictionary consisting of just the key values:

Python

keys = D.keys() # result is {0, 1, 2, 3, 4, 5}
# so
D.keys - removeKeys # gives { 1, 3, 4} --> values 0, 2 and 5 removed

So the dictionary comprehension iterates the list { 1, 3, 4 } and creates a new dictionary using those values as the keys.