def size1(n): for i in range(n): print("".rjust(2*i+1,"*")) 这种怎么用return
时间: 2024-05-26 19:12:33 浏览: 18
这个函数可以使用return来返回一个字符串,而不是直接打印出来。例如:
def size1(n):
result = ""
for i in range(n):
result += "".rjust(2*i + 1, "*") + "\n"
return result
print(size1(5))
输出:
*
***
*****
*******
*********
相关问题
def size1(n): result = "" for i in range(n): result = "".rjust(2 * i + 1, "*") + "\n" return result
The function size1(n) appears to be incomplete and contains errors. Here is a revised version of the function that will return a string of asterisks (*) arranged in a pyramid shape:
```
def size1(n):
result = ""
for i in range(1, n + 1):
row = "* " * i
result += row.center(n * 2 - 1) + "\n"
return result
```
Explanation:
1. `result = ""` initializes an empty string that will be used to store the pyramid.
2. `for i in range(1, n + 1):` loops through the numbers 1 to n (inclusive).
3. `row = "* " * i` creates a string of asterisks and spaces, with i asterisks and i - 1 spaces.
4. `result += row.center(n * 2 - 1) + "\n"` centers the row string in a field of width n * 2 - 1 (to account for the spaces between asterisks), adds a newline character at the end, and appends it to the result string.
5. `return result` returns the completed pyramid string.
Example usage:
```
>>> print(size1(5))
*
* *
* * *
* * * *
* * * * *
```
Note that the pyramid is centered and has a base width of n * 2 - 1.
杨辉三角:编写Python程序,输入一个非负整数n,生成“杨辉三角”的前n行并按下列格式输出,在“杨辉三角”中,每一行的第一个和最后一个都 是1,其它数是它左上方和右上方的数的和,比如下面是n=7时的杨辉三角。
好的,我可以帮你写一个Python程序来实现这个功能。以下是代码:
```python
def generate_pascal_triangle(n):
triangle = [[] for _ in range(n)]
for i in range(n):
for j in range(i+1):
if j == 0 or j == i:
triangle[i].append(1)
else:
triangle[i].append(triangle[i-1][j-1] + triangle[i-1][j])
return triangle
def print_pascal_triangle(n):
triangle = generate_pascal_triangle(n)
max_width = len(str(triangle[-1][-1]))
for row in triangle:
print(" ".join(str(num).rjust(max_width) for num in row))
n = int(input("请输入一个非负整数n:"))
print_pascal_triangle(n)
```
运行程序后,输入一个非负整数n,程序会生成杨辉三角的前n行,并按照题目要求格式输出。例如,当n=7时,程序输出如下:
```
1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
1 5 10 10 5 1
1 6 15 20 15 6 1
```
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