帕斯卡三角多重误差

Question

我有这段代码来打印带有 N 行的帕斯卡三角形（N 表示用户输入他们想要多少行）。我有所需的格式，但我不知道如何使代码工作。

我是 python 和一般编程的新手，并且真的很挣扎 functions。我不知道如何为函数编写参数，以及如何正确传递它们。

问题是从第二个函数开始（def pascal_triangle_tostring()）。我可以获得输入并生成列表。但是从这里我不确定该怎么做。

#should take user input and validates it
def get_triangle_size():
    while True:
        numberOfRows = input("Enter the no. of rows: ")
        try:
            numberOfRows = int(numberOfRows)
        except ValueError:
             print("N must be an integer")
             continue
        if numberOfRows <= 0:
            print("N must be at least 1")
            continue
        break
    return (numberOfRows)

#Should generate Pascals triangle (shaped like a ladder)
def generate_pascal_triangle():
    n = get_triangle_size()
    if n == 1:
        triangle = [[1]]
    elif n == 2:
        triangle = [[1], [1, 1]]
    else:
        triangle = [[1], [1, 1]]
    for i in range(2, n):
        row = [1]
        for j in range(1, i):
            row.append(triangle[i-1][j-1] + triangle[i-1][j])
        row.append(1)
        triangle.append(row)

#should convert the lists of pascal triangle into a string
def pascal_triangle_tostring():
    output = ""
    triangle = get_triangle_size()
    for row in triangle:
        for value in row:
            output += str(value) + "\t"
        output += '\n'

#Main code body should call these functions to print out pascal triangle
print("This program prints a Pascal's triangle with n line")
triangle_size = get_triangle_size()
pascal_triangle = generate_pascal_triangle()
print("Pascal’s triangle with %d lines:\n" % triangle_size)
print(pascal_triangle_tostring(pascal_triangle))

Answer 1

现在我改进了你的代码，所以现在它似乎可以工作了，所以我知道你有问题，所以请问他们。你也应该真正了解python中的function arguments和f strings

#should take user input and validates it
def get_triangle_size():
    # while True:
    numberOfRows = input("Enter the no. of rows: ")
    try:
        numberOfRows = int(numberOfRows)
    except ValueError:
        print("N must be an integer")

    if numberOfRows <= 0:
        print("N must be at least 1")

    return numberOfRows

#Should generate Pascals triangle (shaped like a ladder)
def generate_pascal_triangle(n):
    if n == 1:
        triangle = [[1]]
    elif n == 2:
        triangle = [[1], [1, 1]]
    else:
        triangle = [[1], [1, 1]]
    for i in range(2, n):
        row = [1]
        for j in range(1, i):
            row.append(triangle[i-1][j-1] + triangle[i-1][j])
        row.append(1)
        triangle.append(row)
    return triangle

#should convert the lists of pascal triangle into a string
def pascal_triangle_tostring(triangle):
    output = ""
    for row in triangle:
        for value in row:
            output += str(value) + "\t"
        output += '\n'
    return output

#Main code body should call these functions to print out pascal triangle
print("This program prints a Pascal's triangle with n line")
triangle_size = get_triangle_size()
pascal_triangle = generate_pascal_triangle(triangle_size)
print("Pascal’s triangle with %d lines:\n" % triangle_size)
print(pascal_triangle_tostring(pascal_triangle))