Python operator - zhongjiajie/zhongjiajie.github.com GitHub Wiki
operator — Standard operators as functions
这样做的好处是用户直接调用运算符,不需要了解operator的操作,程序打日志可以直接打印运算符的类型,如果传operator对象,会就比较难打印运算符类型了.
import operator
def get_operator_fn(op):
return {
'+' : operator.add,
'-' : operator.sub,
'*' : operator.mul,
'/' : operator.div,
'%' : operator.mod,
'^' : operator.xor,
}[op]
def eval_binary_expr(op1, oper, op2):
op1,op2 = int(op1), int(op2)
return get_operator_fn(oper)(op1, op2)
print eval_binary_expr(*("1 + 3".split()))
print eval_binary_expr(*("1 * 3".split()))
print eval_binary_expr(*("1 % 3".split()))
print eval_binary_expr(*("1 ^ 3".split()))