python中的星号三角形 [英] Asterisk triangle in python

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问题描述

我必须编写一个递归函数asterisk_triangle,它接受一个整数,然后返回由许多行组成的星号三角形。



例如,这是一个4行星号三角形。

  * 
**
***
****

我想出了这个函数:

<$ p $ ($)

取整数n,然后返回一个
星号三角形,包含(n)多行
(x <= n):
print(** x)
x = x + 1
return

另外,我必须通过操作第一个函数来创建一个颠倒的星号三角形。



我想出了这个函数和结果:

  def upside_down_asterisk_triangle(n):

取整数n,然后返回一个向后的
星号三角形,由(n)个多行

x = 0
while(x < n):
print(**(nx))
x = x + 1
返回


****
***
**
*

现在我必须操作这些函数

  * 
**
***
* ***

还有一个倒过来的星号三角形。

  **** 
***
**
*

我应该实现哪些函数?



我曾尝试使用反向字符串命令[:: - 1]

解决方案

我早些时候已经回答了同样的问题。请记住,您提到的任何函数都不是递归函数。您可以阅读更多关于递归此处



这是我提到的例子此处



Python 3.X

  def asterix_triangle(i,t = 0):
if i == 0:
return 0
else:
print(''*(i + 1 )+'*'*(t * 2 + 1))
return asterix_triangle(i - 1,t + 1)

asterix_triangle(5)

这里有一个递归函数的颠倒版本。

  def upside_down_asterix_triangle(i,t = 0):
if i == 0:
return 0
else:
print(''*(t + 1)+'*'*(i * 2 - 1))
return upside_down_asterix_triangle(i - 1,t + 1)

up side_down_asterix_triangle(5)

Python 2.X

  def asterix_triangle(i,t = 0):
如果我== 0:
返回0
else:
print''*(i + 1)+'*'*(t * 2 + 1)
return asterix_triangle(i - 1,t + 1)

asterix_triangle( 5)

这里有一个递归函数的颠倒版本。

  def upside_down_asterix_triangle(i,t = 0):
如果我== 0:
返回0
else:
print''*(t + 1)+'*'*(i * 2 - 1)
return upside_down_asterix_triangle(i - 1,t + 1)

upside_down_asterix_triangle 5)

编辑: IDE。





Edi t2: 添加了可在Python 3.x下运行的代码
$ b Edit3: 已添加迭代函数为Python 3.X

  def create_pyramid(rows):
for i in range ((''*(rows-i-1)+'*'*(2 * i + 1)))
$ b $ print((create_pyramid(5)) )
$ b $ def def create_upside_down_pyramid(rows):
for i in reverse(list(range(rows))):
print((''*(rows-i - 1) +('*'*(2 * i + 1)))

print((create_upside_down_pyramid(5)))


I have to write a recursive function asterisk_triangle which takes an integer and then returns an asterisk triangle consisting of that many lines.

For e.g this is a 4 line asterisk triangle.

*
**
***
****

I came up with this function:

def asterisk_triangle(n):
    """
    takes an integer n and then returns an
    asterisk triangle consisting of (n) many lines
    """
    x = 1
    while (x <= n):
        print("*" * x)
        x = x + 1
    return

And also I had to create an upside down asterisk triangle by manipulating the first function.

I came up with this function and result:

def upside_down_asterisk_triangle(n):
     """
     takes an integer n and then returns a backwards
     asterisk triangle consisting of (n) many lines
     """
     x = 0
     while (x < n):
          print("*" * (n-x))
     x = x + 1
     return


****
***
**
*

Now I have to manipulate these functions to create a backwards asterisk triangle.

   *
  **
 ***
****

And a backward upside down asterisk triangle.

****
 ***
  **
   *

What functions should I implement?

I have tried using the reverse string command [::-1] after the function and it didn't work.

解决方案

I already answered the same question earlier. Keep in mind that none of the functions you mentioned are recursive functions. You can read more about recursion here.

This is the example I mentioned here.

Python 3.X

def asterix_triangle(i, t=0):
    if i == 0:
        return 0
    else:
        print(' ' * ( i + 1 ) + '*' * ( t * 2 + 1 ))
        return asterix_triangle( i - 1, t + 1 )

asterix_triangle(5)

And here you have an upside down version of an recursive function.

def upside_down_asterix_triangle(i, t=0):
    if i == 0:
        return 0
    else:
        print(' ' * ( t + 1 ) + '*' * ( i * 2 - 1 ))
        return upside_down_asterix_triangle( i - 1, t + 1 )

upside_down_asterix_triangle(5)

Python 2.X

def asterix_triangle(i, t=0):
    if i == 0:
        return 0
    else:
        print ' ' * ( i + 1 ) + '*' * ( t * 2 + 1 )
        return asterix_triangle( i - 1, t + 1 )

asterix_triangle(5)

And here you have an upside down version of an recursive function.

def upside_down_asterix_triangle(i, t=0):
    if i == 0:
        return 0
    else:
        print ' ' * ( t + 1 ) + '*' * ( i * 2 - 1 )
        return upside_down_asterix_triangle( i - 1, t + 1 )

upside_down_asterix_triangle(5)

Edit: Screenshot showing the script running in my IDE.

Edit2: Added code that works under Python 3.x

Edit3: Added iterative function for Python 3.X

def create_pyramid(rows):
    for i in range(rows):
        print((' ' * ( rows- i - 1 ) + '*' * ( 2 * i + 1)))

print((create_pyramid(5)))

def create_upside_down_pyramid(rows):
    for i in reversed(list(range(rows))):
        print((' ' * ( rows- i - 1 ) + '*' * ( 2 * i + 1)))

print((create_upside_down_pyramid(5)))

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