删除子串

#  删除子串 python31讲s="hello andfdfdkjfklsds kjdg edu  lkdandandjgkldjsdslkgjl"sub="dan"print(s)i=0while i<=len(s)-len(sub):      if s[i:i+len(sub)]==sub:            print(i)            s=s[:i]+s[i+len(sub):]            print(s)            i=i-1 #若相邻有多个相同的子串让i回到找到第一个子串指向的位置      i=i+1