Hi all

I have a question about data operation.

I have a file:

a      100
a      20
b      40
c      30
a      60
a      70

I want to obtain the result:

a      60(the average of 100 and 20)
b      40
c      30
d      65the average of 60 and 70)

the process can be described as computing the average value of col2 based on index col1.

I have shell code, but I don't know how to convert to python code.

cat 1.txt |awk -F"," '{sum[$1]+=$2}END{for(c in sum){print c,sum[c]}}'

Any help would be greatly appreciated.