CODEWITHSUNDEEP
pythonpython-3.xpython-2.7listlist-comprehension
user10146914
user10146914

Reputation:

Shortening For Loops

sum_num = 0

for human in humans:
    sum_num += human.limbs
return sum_num

Assume object human has a attribute limbs as in:

human.limbs = rand.int(0, 4)

What would be a good way to shorten this as we would with list comprehension?

sum_num = sum_num + human.limbs for human in humans

Obviously, the above raises an error. Is there no way to shorten some for loop like above?

Upvotes: 1

Views: 248

Answers (1)

Stephen Rauch
Stephen Rauch

Reputation: 49862

The sum function is the Pythonic way to sum. sum() takes an iterable. In this case, a very helpful iterable is the generator expression. Generator expressions use (basically) the same syntax as list comprehensions. Using sum() and a generator expression, what you are trying to do, can be expressed, quite simply, as:

sum(human.limbs for human in humans)

Upvotes: 3

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