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Add butterfly pattern implementation #12151 #12493

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26 changes: 26 additions & 0 deletions graphics/butterfly_pattern.py
Original file line number Diff line number Diff line change
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def butterfly_pattern(n: int) -> str:
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"""
Creates a butterfly pattern of size n and returns it as a string.
"""
result = []

# Upper part
for i in range(1, n + 1):
left_stars = "*" * i
spaces = " " * (2 * (n - i + 2))
right_stars = "*" * i
result.append(left_stars + spaces + right_stars)

# Lower part
for i in range(n - 1, 0, -1):
left_stars = "*" * i
spaces = " " * (2 * (n - i + 2))
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))
8 changes: 8 additions & 0 deletions graphics/test_butterfly_pattern.py
Original file line number Diff line number Diff line change
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from graphics.butterfly_pattern import butterfly_pattern


def test_butterfly_pattern():
expected_output = (
"* *\n" "** **\n" "*** ***\n" "** **\n" "* *"
)
assert butterfly_pattern(3) == expected_output
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