I found SyntaxError in my code, i don't know why

Question:
How can use this simble (+=) to sum numbers in a list

Hello @simaouchen! Could you please provide what language you are using? If you are using Python, you could do:

mylist = [1,4,7]
sumoflist = sum(mylist)
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Please show your code. Else we can’t help you. Faires0feast provides an example of summing up a list.

Note that += upon a list is defined to add to the list, not add numbers.

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This will entirely depend on the language.

In most languages, you reference the ith element of an array using square brackets ([]):

array_variable[element_index]

If you want to use +=, it’s implied you’ve got an accumulative variable to store the sum of the array values:

sum = 0

You would need to loop through each element of your array, most likely using a for loop in your language, and add them to the sum variable:

sum += array_variable[element_index]

An example of a for loop looks like this:

int sum = 0;
for (int i = 0; i < array_length; i++) {
	sum += array_value[i];
}
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