sumifs function in python

Question

I have a list of lists that looks like:

[[\'chr1\', \'3088\', \'1\', 744, \'L1MCc_dup1\']
[\'chr1\', \'3089\', \'1\', 744, \'L1MCc_dup1\']
[\'chr1\', \'3090\', \         


        

Answer 1

Use a dictionary:

d = {}
for row in my_list:
    key = row[4]
    value = int(row[2])
    d[key] = d.get(key, 0) + value

After this loop, d will map the key values in the last column to the desired sums.

You could also use collections.defaultdict instead of a normal dictionary.