Grammar for mini-Python:

1. Program := Statement | Statement Program
2. Statement := DefStatement | IfStatement | ReturnStatement | PrintStatement | WhileStatement | AssignStatment | FunctionCall
3. DefStatement := def identifier ( ArgList ) : Sequence
4. ArgList := identifier Arglist | ε
5. MoreArgs := , identifier MoreArgs | ε
6. IfStatement := if Expression : Sequence else : Sequence
7. WhileStatement := while Expression : Sequence
8. ReturnStatement := return Expression NEWLINE
9. PrintStatement := print Expression NEWLINE
10. AssignStatement := identifier = Expression NEWLINE
11. Sequence := NEWLINE INDENT MoreStatements DEDENT
12. MoreStatements := Statement MoreStatements | Statement
13. Expression := AdditionExpression Comparison
14. Comparison := (<|>|<=|>=|==) AdditionExpression Comparison | ε
15. AdditionExpression := MultiplicationExpression AdditionFactor
16. AdditionFactor := (+|-) MultiplicationExpression AdditionFactor | ε
17. MultiplicationExpression := ElementExpression MultiplicationFactor
18. MultiplicationFactor := (*|/) ElementExpression MultiplicationFactor | ε
19. ElementExpression := PrimitiveExpression ElementAccess
20. ElementAccess := [ Expression ] ElementAcess | ε
21. FunctionCallExpression := PrimitiveExpression ( ExpressionList )
22. ExpressionList := Expression MoreExpressions | ε
23. MoreExpressions := , Expression MoreExpressions | ε
24. PrimitiveExpression := Integer | NAME | ( Expression ) | ListExpression | BAR Expression BAR
25. FunctionCallStatement := PrimitiveExpression ( ExpressionList ) NEWLINE