Example: Pascal Triangle Pattern in Python language using loop

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# Pascal Triangle Pattern in Python language using loop

r, co, ws, i, j = None, 1, None, None, None
# r - denotes the number of rows
# co - denotes the coefficient value
# ws - denotes the white space

print ("-----Enter the number of rows to print the pattern-----")
r = int (input ())

print ("\n-----This is the pascal triangle pattern-----\n")
for i in range (r):
	print (end="\t")
	for ws in range (1, (r + 1) - i):
		print (end="  ")

	for j in range (i + 1):
		if j == 0 or i == 0:
			co = 1
		else:
			co = co * (i - j + 1) / j

		print (end="%4d" %(co))

	print (end="\n")