(1)打印正三角形

# -*-coding:utf-8 -*-
for i in range(1,10):
  for j in range(1,i+1):
    print '*',
  print ' '

 

 (2)打印倒三角形

# -*-coding:utf-8 -*-
for i in range(1,10):
  for j in range(1,10-i):
    print '*',
  print ' '