day13 yield实现range函数

def range(*args,**kwargs):
    if len(args)==1:
        end=args[0]
        start=1
        step = 1
        while start<end:
            yield start
            start+=step
            #pass
    elif len(args)==2:
        start=args[0]
        end=args[1]
        step=1
        while start<end:
            yield start
            start+=step
            #pass
    elif len(args)==3:
        start=args[0]
        end=args[1]
        step=args[2]
        while start<end:
            yield start
            start+=step
            #pass
    else:
        print("非法输入")

print(list(range(2,14,3)))