Beginner: I need help understanding few lines of a code.

[hop_090]

num=int(input('Enter the looping number: '))
for i in range(num):
    for j in range(i):
        print(i, end=' ')
    print(" ")

I wrote a program myself to get a pattern of user prompted number. It worked as I hoped. But I came across above given code. I need help in understanding both the print part and how it works to give following output.

Enter the looping number: 5

1
2 2
3 3 3
4 4 4 4