range范围

-----以下部分摘自雨辰老师的教学

for i in range(5):
    print("Hello world" + str(i))

r = range(5)  # 范围支持序列通用操作
print(r)
print(min(r))
print(max(r))
print(len(r))
print(type(r))
r = range(3, 12)
print(r)
for i in r:
    print(i)

r = range(1, 21, 2)  # 范围可以加步长值
print(r)
for i in r:
    print(i)
print(r.index(7))
print(r.count(1))