I have the following array:
soma_campos = null
tabela = [
['A-B', 22, 0.045, 0.1, 0.005],
['A-C', 50, 0.020, 0.1, 0.002],
['A-D', 48, 0.021, 0.1, 0.002],
['A-E', 29, 0.034, 0.1, 0.003]
]
How can I make the variable soma_campos receive the sum of all the second values of each array?
Only by making a correction, what you've created is actually a list and not an array, the syntax for creating an array would be something like array([1, 2, 3]) , see here a quick explanation of the differences between the two.
To get the values that are in the second item of each sublist, you can use list comprehensions , which " provides a concise way of creating lists "(more on the subject here and here ). The syntax would be this:
valores = [sub_lista[1] for sub_lista in tabela]
This code using list comprehensions does the equivalent of a for loop:
valores = []
for sub_lista in tabela:
valores.append(sub_lista[1])
And to sum these values you can use the sum() function, directly passing the resulting list of values. The final code looks like this:
tabela = [
['A-B', 22, 0.045, 0.1, 0.005],
['A-C', 50, 0.020, 0.1, 0.002],
['A-D', 48, 0.021, 0.1, 0.002],
['A-E', 29, 0.034, 0.1, 0.003]
]
soma_campos = sum([sub_lista[1] for sub_lista in tabela])
print('Soma dos campos: ', soma_campos)
See an example on Ideone .