n=5
i=0
j=1
line=''

for i in range(i,n+1):
    for j in range(j,i+1):
        line = line + str(j) + " "
        j += 1
    i +=1
    print( line)

1
1 2
1 2 3
1 2 3 4
1 2 3 4 5

n=5
i=0
j=1
line=''

for i in range(i,n+1):
    for j in range(j,i+1):
        line = line + str(j) + " "
        #j += 1       ##Commenting the inner loop
    #i +=1            ##Commenting the outer loop
    print( line)

1
1 1 2
1 1 2 2 3
1 1 2 2 3 3 4
1 1 2 2 3 3 4 4 5