printing hollow triangle in python
# Generating Hollow Pyramid Pattern Using Stars
row = int(input('Enter number of rows required: '))
for i in range(row):
for j in range(row-i):
print(' ', end='') # printing space required and staying in same line
for j in range(2*i+1):
if j==0 or j==2*i or i==row-1:
print('*',end='')
else:
print(' ', end='')
print() # printing new line