How to sum a bunch of variables?

Question

Suppose we have 1000 variables:

a_1 = 4
a_2 = 6
.
.
.
a_1000 = 76

What would be the best/most efficient way to sum these variables? Would something like the below work:

  sum_all_list = []
    for i in range(1001):
        sum_all_list.append(globals()['a_{}'.format(i)])
  sum_all = sum(sum_all_list)

Answer 1

You can use the dir() and eval() functions:

a_1 = 4
a_2 = 6
a_3 = 5
a_4 = 2
a_8 = 5
a_1859 = 20
varList = dir()
sum = 0
for var in varList:
  if "a_" in var:
    sum += eval(var)

print(sum)

Resulting output:

42