# Changes compared to version 2:

# The syntax of Boolean operations is changed to use more

# 'import' and 'def' aren't special any more;

# added 'from' NAME option on import clause, and '*' to import all;

# added class definition.

# Start symbols for the grammar:

# single_input is a single interactive statement;

fpdef: NAME | '(' fplist ')'

stmt: simple_stmt | compound_stmt

expr_stmt: (exprlist '=')* exprlist NEWLINE

# For assignments, additional restrictions enforced by the interpreter

print_stmt: 'print' (test ',')* [test] NEWLINE

del_stmt: 'del' exprlist NEWLINE

pass_stmt: 'pass' NEWLINE

flow_stmt: break_stmt | return_stmt | raise_stmt

break_stmt: 'break' NEWLINE

term: factor (('*'|'/'|'%') factor)*

factor: ('+'|'-') factor | atom trailer*

atom: '(' [testlist] ')' | '[' [testlist] ']' | '{' '}' | '`' testlist '`' | NAME | NUMBER | STRING

subscript: expr | [expr] ':' [expr]

exprlist: expr (',' expr)* [',']

testlist: test (',' test)* [',']