Newbie help with array handling

[loial]

I am new to python and am converting an awk script to python

I need to store some data in an array/table of some form

keyvalue1, value1, value2, value3
keyvalue2, value1,value2, value3
keyvalue3, value1,value2,value3
etc

I will later need to sort in keyvalue order and also need to be able
to check if a key already exists

It is not clear how to do this in python. All the examples I see have
just a key and a single value