Nested Loop Python

Question

count = 1
for i in range(10):
    for j in range(0, i):
        print(count, end=\'\')
        count = count +1
    print()
input()

I am writing a

Answer 1

This is one line solution. A little bit long:

print ('\n'.join([str(i)*i for i in range(1,10)]))