用多种程序语言编写杨辉三角

杨辉三角是一个数学术语，它是一种二项式系数的几何排列形式，常用于组合数学和概率论中。我们可以用多种编程语言来展示杨辉三角，下面分别给出Python和JavaScript的例子：

**Python**

def print_pascal_triangle(n):
    triangle = [[1]]
    for _ in range(1, n):
        new_row = [1]
        for j in range(1, len(triangle[-1]) - 1):
            new_row.append(triangle[-1][j] + triangle[-1][j - 1])
        new_row.append(1)
        triangle.append(new_row)
    for row in triangle:
        print(' '.join(str(num) for num in row))

# 打印前5行杨辉三角
print_pascal_triangle(5)

**JavaScript**

function generatePascalTriangle(n) {
    let triangle = [[]];
    for (let i = 0; i < n; i++) {
        let newRow = [1];
        for (let j = 0; j <= i; j++) {
            if (j === 0 || j === i) newRow.push(1);
            else newRow.push(triangle[i - 1][j - 1] + triangle[i - 1][j]);
        }
        newRow.push(1);
        triangle.push(newRow);
    }
    return triangle;
}

// 输出前5行杨辉三角
generatePascalTriangle(5).map(row => row.join(' ')).forEach(row => console.log(row));