如何在python中结合这两个功能

Question

I currently have created this code in python. The output is exactly what I want. (If you know of a better way to get it, I am open to hear). I want to know how I can combine my functions triangle and triangle2 into one main function. (My output is a sideways pyramid).

def triangle(n): 
   for x in range(n):
        print ('*'*x)
        n = n - 1 

def triangle2(n): 
   for x2 in range(n):
        print ('*'*n)
        n = n - 1

height = int(input("Enter an odd number greater than 4: "))

triangle(height)
triangle2(height)

Answer 1

Just put the two loops together into one function, but don't alter n until the second loop (the first doesn't use it anyway):

def sideways_pyramid(n): 
   for x in range(n):
        print('*' * x)

   for x in range(n):
        print('*' * n)
        n = n - 1

You can avoid altering n altogether by counting down with the range() instead:

def sideways_pyramid(n): 
   for x in range(1, n):
        print('*' * x)

   for x in range(n, 0, -1):
        print('*' * x)

The second loop counts down, starting at n and ending at 1. I also start the first loop at 1, to not print an empty first line (0 times '*' is an empty string)

Demo:

>>> def sideways_pyramid(n): 
...    for x in range(1, n):
...         print ('*' * x)
...    for x in range(n, 0, -1):
...         print ('*' * x)
... 
>>> sideways_pyramid(5)
*
**
***
****
*****
****
***
**
*

Answer 2

def triangle(n):
   for x in range(n):
        print ('*'*x)
   for x in range(n):
        print ('*'*n)
        n -= 1

height = int(input("Enter an odd number greater than 4: "))

triangle(height)

Answer 3

To keep it as close to your original Code as possible:

def triangle2(n): 
       for x2 in range(n):
            print ('*'*n)
            n = n - 1    

def triangle(n): 
       for x in range(n):
            print ('*'*x)
       triangle2(n)  

height = int(input("Enter an odd number greater than 4: "))

triangle(height)

You can just call your other function from the first one.

Answer 4

If you always want to run them both in the order specified at the bottom I would do something like this:

def triangle(n): 
    for x in [y for y in range(n)] + [z for z in range(n, 0, -1)]:
        print("*"*x)


height = int(input("Enter an odd number greater than 4: "))

triangle(height)