怎么才能让第一行是0，第二行是01，第三行是012……

Question

a=0
while a<4:
a+=1
b=0
while b<5:
if b<a:
b+=1
print(b,end="")
elif b==a:
print("")
break

Answer 1

a=0
while a<4:
    for i in range(0,a+1):
        print(i,end = "")
    print("",end="\n")
    a+=1

上面↑的是到0123，下面↓是自己输入

a=0
b = int(input())
while a<b:
    for i in range(0,a+1):
        print(i,end = "")
    print("",end="\n")
    a+=1