TheAlgorithms/Python · error · ValueError

Each move must have exactly two numbers.

Error message

Each move must have exactly two numbers.

What it means

Error "Each move must have exactly two numbers." thrown in TheAlgorithms/Python.

Source

Thrown at matrix/matrix_based_game.py:122

def parse_moves(input_str: str) -> list[tuple[int, int]]:
    """
    >>> parse_moves("0 1, 1 1")
    [(0, 1), (1, 1)]
    >>> parse_moves("0 1, 1 1, 2")
    Traceback (most recent call last):
        ...
    ValueError: Each move must have exactly two numbers.
    >>> parse_moves("0 1, 1 1, 2 4 5 6")
    Traceback (most recent call last):
        ...
    ValueError: Each move must have exactly two numbers.
    """
    moves = []
    for pair in input_str.split(","):
        parts = pair.strip().split()
        if len(parts) != 2:
            raise ValueError("Each move must have exactly two numbers.")
        x, y = map(int, parts)
        moves.append((x, y))
    return moves


def find_repeat(
    matrix_g: list[list[str]], row: int, column: int, size: int
) -> set[tuple[int, int]]:
    """
    Finds all connected elements of the same type from a given position.

    >>> find_repeat([['A', 'B', 'A'], ['A', 'B', 'A'], ['A', 'A', 'A']], 0, 0, 3)
    {(1, 2), (2, 1), (0, 0), (2, 0), (0, 2), (2, 2), (1, 0)}
    >>> find_repeat([['-', '-', '-'], ['-', '-', '-'], ['-', '-', '-']], 1, 1, 3)
    set()
    """

    column = size - 1 - column

View on GitHub (pinned to f5988cc097)

Solutions

1. Pass a move containing exactly two numbers (row and column).

When it happens

Trigger: Thrown at matrix/matrix_based_game.py:122 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of TheAlgorithms/Python@f5988cc097 (2026-08-14). Data as JSON: /api/errors/22f91fedc86af26e. Report an issue: GitHub.