notation

[MCL169]

for line in lines:                                          # str, '19260701,0.09,-0.22,-0.30,0.009\n'
    curr_line = line.split()                                # list, ['19260701', '0.09', '-0.22, '-0.30', '0.009']
    my_date = curr_line[0]                              # str, '19260701' 

My question is about the notation
for "my_date = curr_line[0]" is it "# str, '19260701'" or #str, '19260701', '0.09', '-0.22, '-0.30', '0.009'

I believe curr_line[0] is 0 index for first string in first list ( '19260701') but im not sure.