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- import socket
- def find_available_tcp_port() -> int:
- """Find an available TCP port, return -1 if none available."""
- sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
- try:
- sock.bind(('localhost', 0))
- port = sock.getsockname()[1]
- return port
- except Exception:
- return -1
- finally:
- sock.close()
- def display_number_matrix(number: int) -> str | None:
- if not 0 <= number <= 999:
- return None
- # Define the matrix representation for each digit
- digits = {
- '0': ['###', '# #', '# #', '# #', '###'],
- '1': [' #', ' #', ' #', ' #', ' #'],
- '2': ['###', ' #', '###', '# ', '###'],
- '3': ['###', ' #', '###', ' #', '###'],
- '4': ['# #', '# #', '###', ' #', ' #'],
- '5': ['###', '# ', '###', ' #', '###'],
- '6': ['###', '# ', '###', '# #', '###'],
- '7': ['###', ' #', ' #', ' #', ' #'],
- '8': ['###', '# #', '###', '# #', '###'],
- '9': ['###', '# #', '###', ' #', '###'],
- }
- # alternatively, with leading zeros: num_str = f"{number:03d}"
- num_str = str(number) # Convert to string without padding
- result = []
- for row in range(5):
- line = ' '.join(digits[digit][row] for digit in num_str)
- result.append(line)
- matrix_display = '\n'.join(result)
- return f'\n{matrix_display}\n'
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