用*打印等边三角形

line = int(input('请输入边长'))
row = 1 
while row <= line:
	left = line - row +1
	while left >0:
		print(' ',end ='')
		left -= 1
	star = 2*row - 1
	star = row
	while star > 0:
		print('*',end ='')
		print(' ',end ='') 
		star -= 1
	right = line - row +1
	while right >0:
		print(' ',end ='') 
		right -= 1
	print('')
	row += 1