python如何格式化输出杨辉三角

在Python中，可以使用嵌套循环和字符串格式化功能来输出杨辉三角。以下是一个示例代码：

def generate_pascals_triangle(n):     triangle = []     for i in range(n):         row = [1]         if triangle:             last_row = triangle[-1]             row.extend([sum(pair) for pair in zip(last_row, last_row[1:])])             row.append(1)         triangle.append(row)     return triangle  def print_pascals_triangle(triangle):     n = len(triangle)     max_width = 2 * n - 1     for i, row in enumerate(triangle):         row_str = " ".join(str(num) for num in row)         padding = (max_width - len(row_str)) // 2         print(" " * padding + row_str + " " * padding)  n = int(input("请输入杨辉三角的行数：")) triangle = generate_pascals_triangle(n) print_pascals_triangle(triangle) 

这段代码首先定义了两个函数：generate_pascals_triangle()用于生成杨辉三角，print_pascals_triangle()用于打印杨辉三角。然后，根据用户输入的行数生成杨辉三角并打印出来。