python - 帕斯卡三角形 - 类型错误

Question

所以我的代码由于某种原因给了我错误:

TypeError: Can't convert 'int' object to str implicitly

这与以下行有关:

answer = answer + combination(row, column) + "\t"

这是我的代码:

def combination(n, k):
    if k == 0 or k == n:
        return 1
    return combination(n - 1, k - 1) + combination(n - 1, k)

def pascals_triangle(rows):
    for row in range(rows):
        answer = ""
        for column in range(row + 1):
            answer = answer + combination(row, column) + "\t"
        print(answer)

pascals_triangle(10)

Answer 1

TypeError: Can't convert 'int' object to str implicitly

在这一行中:

answer = answer + combination(row, column) + "\t"
         ^        ^                           
         |__ str  |__ int

combination() 返回一个 int，在 Python 中你不能隐式执行“str + int”，因此将其显式转换为 str :

answer = answer + str(combination(row, column)) + "\t"

您还可以避免字符串串联:

answer = '{ans} {comb} \t'.format(ans=answer, comb=combination(row, column))