这题怎么注释 看不懂啊
def mymap(iter,op,value):
if op not in '+-*/':
return 'ERROR OPERATOR'
def nested(item):
# repr 返回对象的字符串形式
return eval(repr(item)+op+repr(value))
return map(nested,iter)
a = list(mymap(range(5),'+',5))
print(a)