Python Script Object Notation

PSON.py

def stringify(obj):
    return str(obj)
    
def parse(string):
    if string[0] == ' ':
        raise Exception('cannot parse')
    for i in __builtins__.__dict__:
        if string.startswith(i+'('):
            raise Exception('cannot parse')
        if string.startswith(i+' '):
            raise Exception('cannot parse')
    return eval(string)