Let's say I have a list (or other iterable object) ['a','b','c','d']. I have a dict X. I can sum them up in the naive way:
s = 0
for k in ['a','b','c','d']:
s += X[k]
But is there a more pythonic way?
You can do:
s = sum(X[k] for k in ['a','b','c','d'])
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