First and Follow functions are used to aid the LL algorithm in parsing.

And then use First and Follow functions to compute the parsing table

1. Compute First as follows

from  first import getFirst
firstMap = getFirst(input)

2. Compute Follow as follows

from  follow import  getFollow
       
followMap = getFollow(input)

3. Compute Parsing Table as follows

from parsingtable import  createParseTable

input = "./expression"
table = createParseTable(input)