pyramid.py

count = 9

for i in range(count * 2 - 1):
	line = ''
	maxNum = i + 1 if i < count else count * 2 - i - 1
	for c in range(1, maxNum * 2): line += str(c) if c < maxNum else str(maxNum * 2 - c)
	print((count - maxNum) * ' ' + line)

Animated version from 2 to 9

import time

for count in range(2, 10):
	print(chr(27) + "[2J")
	for i in range(count * 2 - 1):
		line = ''
		maxNum = i + 1 if i < count else count * 2 - i - 1
		for c in range(1, maxNum * 2): line += str(c) if c < maxNum else str(maxNum * 2 - c)
		print((count - maxNum) * ' ' + line)
	time.sleep(.1)