Filtering a nested list without using a for loop?

Question

Hi does anyone know if I can filter a nested list to return only the second value in each sub-list? I can do it using a for-loop, just wondering if it possible to use the filter method?

weather_data = [['1', 'sunny'], ['2', 'rainy'], ['3', 'sunny']]

return:

weather = ['sunny', 'rainy', 'sunny']

Anatolii · Accepted Answer · 2018-06-16 10:31:49Z

1

How about to use a list comprehension:

values = [x[1] for x in weather_data]
print (values)

answered Jun 16, 2018 at 10:31

Anatolii

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vahdet · Accepted Answer · 2018-06-16 10:33:29Z

1

Supposing the snake_case you have chosen in your question implies Python, try map function:

weather_data = [['1', 'sunny'], ['2', 'rainy'], ['3', 'sunny']]
result = list(map(lambda x: x[1], weather_data))
print(result)

If not Python, plenty of other languages have this functionality in slightly different syntaxes:

https://en.wikipedia.org/wiki/Map_(higher-order_function)#Language_comparison

answered Jun 16, 2018 at 10:33

vahdet

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