I need additional python codes that will number the left column of the output below like I have shown in the right column: The codes here just divides the sequence into 3s. Now I want to number them from 1 to the last as I have done manually in the right column.
cds = "atgagtgaacgtctgagcattaccccgctggggccgtatatcggcgcacaataa"
for i in range(0,len(cds),3):
print cds[i:i+3],
...
Atg 1
Agt 2
Gaa 3
Cgt 4
Ctg 5
Agc 6
Att 7
Acc 8
Ccg 9
Ctg 10
Ggg 11
Ccg 12
Tat 13
Atc 14
Ggc 15
Gca 16
Caa 17
Taa 18
Taa 19