在Python中使用2D列表:查找、匹配和追加字符串

def find_value(matrix, target):
    for row in matrix:
        for value in row:
            if value == target:
                return True
    return False

def match_string(matrix, prefix):
    matches = []
    for row in matrix:
        for value in row:
            if isinstance(value, str) and value.startswith(prefix):
                matches.append(value)
    return matches

def append_string(matrix, row, col, string):
    if row < len(matrix) and col < len(matrix[row]):
        matrix[row][col] += string