How to generate a hollow right-angled triangle in Python
In this shot, we will discuss how to generate a hollow right-angled triangle with stars in Python.
We can print a plethora of patterns with Python. The basic and only prerequisite is a good understanding of how loops work in Python.
Here, we will use simple for loops to generate a hollow right-angled triangle with stars.
Description
A triangle is said to be right-angled if it has an angle equal to 90 degrees on its left side.
We will use 2 for loops:
- Outer loop: To handle the number of rows.
- Inner loop: To handle the number of columns.
# Number of rows
n = 5
# Loop through rows
for i in range(1, n+1):
# Loop through columns
for j in range(1, n+1):
# Printing Pattern
if (i == j) or (j == 1) or (i == n):
print("*", end=" ")
else:
print(" ", end=" ")
print() Explanation
-
In line 2, we take the input for the number of rows (i.e. the length of the triangle).
-
In line 4, we create a
forloop to iterate through the number of rows. -
In line 6, we create an inner nested
forloop to iterate through the number of columns. -
From lines 8 to 11, we use conditional statements to create the pattern. The end statement helps to stay on the same line.
-
In line 12, we use the
print()statement to move to the next line.
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