以下是几种使用 Python 编写的实现输出杨辉三角前 n 行的函数代码： ### 方法一：使用定义法生成杨辉三角 ```python def generate_pascal_triangle(n): triangle = [[1], [1, 1]] if n == 1: return [[1]] elif n == 2: return triangle for i in range(2, n): pre = triangle[i - 1] cul = [1] for j in range(i - 1): cul.append(pre[j] + pre[j + 1]) cul.append(1) triangle.append(cul) return triangle n = int(input("输入要打印的行数：")) triangle = generate_pascal_triangle(n) print("普通输出:{}".format(triangle)) for i in range(n): s = " " * (n - i - 1) for j in triangle[i]: s = s + str(j) + " " print(s) ``` ### 方法二：简洁函数打印杨辉三角 ```python def print_pascals_triangle(n): triangle = generate_pascal_triangle(n) width = len(" ".join(map(str, triangle[-1]))) for row in triangle: print(" ".join(map(str, row)).center(width)) def generate_pascal_triangle(n): triangle = [] for i in range(n): row = [1] * (i + 1) for j in range(1, i): row[j] = triangle[i - 1][j - 1] + triangle[i - 1][j] triangle.append(row) return triangle n = int(input("请输入要打印的行数：")) print_pascals_triangle(n) ``` ### 方法三：使用递归和格式化输出 ```python def triangles(i, j): if j == 0 or j == i: return 1 return triangles(i - 1, j - 1) + triangles(i - 1, j) n = int(input("请输入要打印的行数：")) for i in range(n): for _ in range(n - i - 1): print(" ", end=" ") for j in range(i + 1): print("%6d" % triangles(i, j), end=" ") print() ``` ### 方法四：另一种实现方式 ```python def generate_pascal_triangle(n): res = [] if n == 0: return res elif n == 1: res = [[1]] return res else: res = [[1]] for i in range(1, n): temp = [1] for j in range(i): if j + 1 == i: temp.append(1) else: temp.append(res[i - 1][j] + res[i - 1][j + 1]) res.append(temp) return res n = int(input("请输入要打印的行数：")) triangle = generate_pascal_triangle(n) print(triangle) ```