How to generate an inverted solid equilateral triangle in Python
In this shot, we will discuss how to generate an inverted solid equilateral triangle using alphabets.
We can print a plethora of patterns using Python. The basic and only prerequisite is a good understanding of how loops work in Python. Here we will be using simple for loops to generate inverted solid equilateral triangle using alphabets.
Description
An equilateral triangle is one which has all its 3 sides of the same length. An inverted equilateral triangle will just be the inverted form of the same with its vertex lying on the bottom. To execute the same using Python programming, we will be using two for loops nested within an outer for loop:
- An outer loop: To handle the number of rows and columns.
- Two inner loops: One to handle the initial spaces and the other to print the given pattern.
Code
Let’s have a look at the code.
# User Input for number of rows and columns (Length of Triangle)
num = 8
# Loop over number of rows and columns
for i in range(num, 0, -1):
# Spaces across rows
for j in range(0, num-i):
print(end=" ")
# Print spaced alphabets
for j in range(0, i):
ch = chr(64+i)
print(ch, end=" ")
# Go to next line
print()
Explanation
-
In line 2, the user gives input to specify the number of rows and columns i.e., length of triangle.
-
In line 5, we create an outer
forloop to loop over the rows and columns. -
In lines 8 and 9, we create an inner
forloop to print the initial spaces across the rowsNum - i.i = 6==> 6 - 6 = 0 spacesi = 5==> 6 - 5 = 5 spacesi = 4==> 6 - 4 = 4 spaces and so on
-
In lines 12 to 14, we create our second inner loop to print the characters and spaces in between them.
- Initially
i = 6==> therefore 6 characters - Next
i = 5==> therefore 6 characters - Next
i = 4==> therefore 4 stars … and so on end = " "gives spaces between characters
- Initially
Note: We have defined
chwhich is used to create alphabets from numbers by using the iterative value ofiand the concept of ASCII conversion. The starting value64+(i=1)has been used as ASCII value ofA(starting of the triangle).
- Finally in line 17, we use the
print()outside the inner loops but inside the outer loop to move to the next line.
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