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Я использую python 2.7 iter.product для генерации декартова произведения трех наборов данных.Добавление меток в набор данных, сгенерированный itertools.product
Это то же самое, что и три вложенных цикла. Однако перед входом в цикл я хочу напечатать ярлык «Тип фруктов:» и «Тип дерева:» Если это не ясно, я поставлю пример вывода, который я хочу ниже.
Что такое питонический способ сделать это, я мог бы создать декартов. продукт наборов, а затем добавить метки в пост-обработки, но разве это не означает, что цель использования itertools уменьшает объем памяти?
Пример кода
import itertools
FRUITS=['apple','orange','pear']
TREES=['ash','oak','beech']
ANIMALS=['dog','cat','horse']
def foo(a,b,c):
print "fruit is " + str(a) + ", tree is " + str(b) + ", animal is " + str(c)
[ foo(a,b,c) for a, b, c in itertools.product(FRUITS, TREES, ANIMALS)]
Выходной хотел
*************************************** Fruit Type: apple *************************************** --------------------------------------- Tree Type: ash --------------------------------------- fruit is apple, tree is ash, animal is dog fruit is apple, tree is ash, animal is cat fruit is apple, tree is ash, animal is horse --------------------------------------- Tree Type: oak --------------------------------------- fruit is apple, tree is oak, animal is dog fruit is apple, tree is oak, animal is cat fruit is apple, tree is oak, animal is horse --------------------------------------- Tree Type: beech --------------------------------------- fruit is apple, tree is beech, animal is dog fruit is apple, tree is beech, animal is cat fruit is apple, tree is beech, animal is horse --------------------------------------- Tree Type: ash --------------------------------------- *************************************** Fruit Type: orange *************************************** --------------------------------------- Tree Type: ash --------------------------------------- fruit is orange, tree is ash, animal is dog fruit is orange, tree is ash, animal is cat fruit is orange, tree is ash, animal is horse --------------------------------------- Tree Type: oak --------------------------------------- fruit is orange, tree is oak, animal is dog fruit is orange, tree is oak, animal is cat fruit is orange, tree is oak, animal is horse --------------------------------------- Tree Type: beech --------------------------------------- fruit is orange, tree is beech, animal is dog fruit is orange, tree is beech, animal is cat fruit is orange, tree is beech, animal is horse *************************************** Fruit Type: pear *************************************** --------------------------------------- Tree Type: ash --------------------------------------- fruit is pear, tree is ash, animal is dog fruit is pear, tree is ash, animal is cat fruit is pear, tree is ash, animal is horse --------------------------------------- Tree Type: oak --------------------------------------- fruit is pear, tree is oak, animal is dog fruit is pear, tree is oak, animal is cat fruit is pear, tree is oak, animal is horse --------------------------------------- Tree Type: beech --------------------------------------- fruit is pear, tree is beech, animal is dog fruit is pear, tree is beech, animal is cat fruit is pear, tree is beech, animal is horse