请输入层数:10
0
12
345
6789
01234
567890
1234567
89012345
678901234
5678901234

line_number = int(input("请输入层数:"))
now_number = 0
for row in range(1, line_number + 1):
    for i in range(row):
        print(now_number, end="")
        now_number += 1
        if now_number == 10:
            now_number = 0
    print()