[Solved] python how to create a new array, list or even a new column with objects from an array, list or column with a set criteria

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Is this what you mean? 

print(len([x for x in train['Survived'] if x == 1]))

For more info, check out list comprehension

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solved python how to create a new array, list or even a new column with objects from an array, list or column with a set criteria