# range(start, end, step)
# print(range(1, 10, 1))
# for i in range(1, 10, 1):
#     print(i)

# for i in range(1, 10):
#     print(i)

# for i in range(1, 10, 2):
#     print(i)


for i in range(10):
    print(i)

# 1. 如果不写开始，默认从0开始
# 2. 如果不写步长，默认为1

