Question

Programming: Python

Python homework

Triangle: Digital + Right Angle + Reverse Right Angle

[Homework 4] Enter an integer. If it is a positive integer, it will draw a regular triangle; if it is a negative integer, it will draw an inverted triangle.

[Example 1]

Input

1

Output

1

[Example 2]

Input

4

Output

1

2 2

3 3 3

4 4 4 4

[Example 3]

Input

-5

Output

5 5 5 5 5

4 4 4 4

3 3 3

2 2

1

§ Please write the program comments, and I hope that the comments can be as detailed as possible.

Answer 1

SOURCE CODE:

*Please follow the comments to better understand the code.

**Please look at the Screenshot below and use this code to copy-paste.

***The code in the below screenshot is neatly indented for better understanding.


n = int(input())
if n > 0:
    # print the regular triangle
    # start with 1 and end with n
    # here range(start,end) will go to end-1, so use n+1 so that it goes till n
    for i in range(1, n + 1):
        # repeat i with space for i times
        print((str(i) + ' ') * i)
else:
    # print the inverted triangle
    # start with n and repeat till 1, step is -1
    # change sign
    n = -n
    for i in range(n, 0, -1):
        # repeat i with space for i times
        print((str(i) + ' ') * i)

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