USING number 1 to do number 2. I already have 1 I just need the for 2.

Coding for NUMBER 2 ONLY in PYTHON

1.) Define an EBNF grammar for any valid number, not starting with zero, like the next examples: 1 102 9723 Next examples won't be accepted 0123 123abc 12E4 Just consider that the "tokens" are not separated with spaces in this case. If this is a problem, then include a space between digits. 2. Create a recursive-descent parser in python for recognizing the expressions.