Inverted triangle pattern in Python

An inverted triangle is the star triangle upside down: the first row is the longest, and each row has one star less.

The program

rows = int(input("Number of rows: "))

for i in range(rows, 0, -1):
    print("*" * i)

Typed in this example: 5. Press Run to type your own.

Number of rows: 5
*****
****
***
**
*

How it works

• range(rows, 0, -1) counts down: 5, 4, 3, 2, 1. The third number, -1, is the step. The end value 0 is not included.
• "*" * i repeats the star i times, so the rows get shorter.

Other inverted shapes

The same countdown loop prints three more shapes. Each row puts its spaces in front, so no line ends with a space:

rows = 5

print("Right-aligned:")
for i in range(rows, 0, -1):
    print(" " * (rows - i) + "*" * i)

print("Inverted pyramid:")
for i in range(rows, 0, -1):
    print(" " * (rows - i) + "*" * (2 * i - 1))

print("Numbers:")
for i in range(rows, 0, -1):
    print(*range(1, i + 1))

Right-aligned:
*****
 ****
  ***
   **
    *
Inverted pyramid:
*********
 *******
  *****
   ***
    *
Numbers:
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1

• In the right-aligned triangle, each row has one more space and one star less, so the length of every line is 5.
• The inverted pyramid has 2 * i - 1 stars per row (9, 7, 5, 3, 1). Put it under a normal pyramid and you get a diamond.
• print(*range(1, i + 1)) prints the numbers 1 to i with spaces between them.