diamond pattern in python

1h = eval(input("please enter diamond's height:"))
2
3for i in range(h):
4    print(" "*(h-i), "*"*(i*2+1))
5for i in range(h-2, -1, -1):
6    print(" "*(h-i), "*"*(i*2+1))
7
8# please enter diamond's height:4
9#      *
10#     ***
11#    *****
12#   *******
13#    *****
14#     ***
15#      *
16#
17# 3, 2, 1, 0, 1, 2, 3  space
18# 1, 3, 5, 7, 5, 3, 1  star
19
20# please enter diamond's height:5
21#       *
22#      ***
23#     *****
24#    *******
25#   *********
26#    *******
27#     *****
28#      ***
29#       *
30#
31# 4, 3, 2, 1, 0, 1, 2, 3, 4  space
32# 1, 3, 5, 7, 9, 7, 5, 3, 1  star

1num = 9
2
3for i in range(1, num+1):
4  i = i - (num//2 +1)
5  if i < 0:
6    i = -i
7  print(" " * i + "*" * (num - i*2) + " "*i)
8