Python入門 部分文字列を削除したいのですが？

#!/usr/local/env python3

my_str = "Welcome to LinuxHint World!"

print("Original String  : " + my_str)
# Original String  : Welcome to LinuxHint World!

print("Resultant String : " + my_str.replace("Welcome ",""))
# Resultant String : to LinuxHint World!

#!/usr/local/env python3

my_str = "Welcome to LinuxHint World!"

print("Original String  : " + my_str)
# Original String  : Welcome to LinuxHint World!

# 削除したい単語リスト
sub_str=["Welcome","to"]

for i in sub_str:
  my_str=my_str.replace('' + i + ' ', "");

  print("Resultant String : " + my_str)
# Resultant String : LinuxHint World!