[Python] How to make a triangle of x's in python?

How would I write a function that produces a triangle like this:

x
xx
xxx
xxxx
xxxxx


Let's say the function is def triangle(n), the bottom row would have n amount of x's

All I know how to do is make a box:

n = 5
for k in range(n):
for j in range(n):
print('x', end='')
print()

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