Not to mention the idiomatic way might just be one of:
# before generator expressions (generates intermediate list)
result = dict([ (k, value) for k in keys ])
# with generator expressions (lazy iteration)
result = dict((k, value) for k in keys)
# with dict comprehension (brand new, probably the fastest)
result = { k: value for k in keys }
is fine if value is immutable e.g., a string, number.
Your code doesn't solve the mutability problem (each value is the exact same object. If you modify it for one key; the values are modified for all keys).
For a mutable type you need to create a new value for each key:
I know that, but I willfully replicated the original code behavior and made it idiomatic (which has the advantage of making it both obvious and easily adjustable)
