learn Python By Example – How to Apply Operations Over Items In A List

Apply Operations Over Items In A List

Method 1: map()


/* Create a list of casualties from battles */
battleDeaths = [482, 93, 392, 920, 813, 199, 374, 237, 244]
/* Create a function that updates all battle deaths by adding 100 */
def updated(x): return x + 100
/* Create a list that applies updated() to all elements of battleDeaths */
list(map(updated, battleDeaths))
[582, 193, 492, 1020, 913, 299, 474, 337, 344]

Method 2: for x in y

/* Create a list of deaths */
casualties = [482, 93, 392, 920, 813, 199, 374, 237, 244]
/* Create a variable where we will put the updated casualty numbers */
casualtiesUpdated = []
/* Create a function that for each item in casualties, adds 10 */
for x in casualties:
    casualtiesUpdated.append(x + 100)
/* View casualties variables */
casualtiesUpdated
[582, 193, 492, 1020, 913, 299, 474, 337, 344]

Method 3: lambda functions

/* Map the lambda function x() over casualties */
list(map((lambda x: x + 100), casualties))
[582, 193, 492, 1020, 913, 299, 474, 337, 344]

 

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