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47def butterfly_pattern(n: int) -> str:
"""
Creates a butterfly pattern of size n and returns it as a string.
>>> print(butterfly_pattern(3))
* *
** **
*****
** **
* *
>>> print(butterfly_pattern(5))
* *
** **
*** ***
**** ****
*********
**** ****
*** ***
** **
* *
"""
result = []
# Upper part
for i in range(1, n):
left_stars = "*" * i
spaces = " " * (2 * (n - i) - 1)
right_stars = "*" * i
result.append(left_stars + spaces + right_stars)
# Middle part
result.append("*" * (2 * n - 1))
# Lower part
for i in range(n - 1, 0, -1):
left_stars = "*" * i
spaces = " " * (2 * (n - i) - 1)
right_stars = "*" * i
result.append(left_stars + spaces + right_stars)
return "\n".join(result)
if __name__ == "__main__":
n = int(input("Enter the size of the butterfly pattern: "))
print(butterfly_pattern(n))