迭代器加生成器

def new_range(start, stop, step = 1):

    while start < stop:
        yield start
        start += step

for i in new_range(1, 20, 4):
    print(i)

D:\Python\Python36\python.exe D:/Python_test/day_lesson/test.py
1
5
9
13
17

Process finished with exit code 0