[Python] Why does my attempt at printing a triangle come out as a straight column?

My program is not executing the way it should. I am trying to create a right triangle using asterisks in Python 3. I am using the exact code from the text book but it comes out as a straight column:

size = 7

for row in range (size):
for col in range (row + 1):
print('*', end='')
print()


Results in:

*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*

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