Print one christmas tree on terminal using star char

xmas_tree.py

space = " "
j = 1
print "Weihnachtsbaum in Python 2.x"
start = 1
stop = 6
incr = 2
for i in range(start,stop,incr):
    if i < stop - 1 :
    	print space*j ,"*" * i
    	j -= 1
    else:
        print "*" * i