用Python的循环和if语句创建回文检查器

Question

我正试图按照指示创建回文。给我半个函数，我得填空。我目前无法使循环正常工作。我也不确定如何在不使用+或逗号的情况下将字符添加到字符串的开头或结尾。我不认为这是我被要求做的。这是说明书；

def is_palindrome(input_string):
    # We'll create two strings, to compare them
    new_string = input_string.replace(" ", "")
    reverse_string = input_string.replace(" ", "")
    # Traverse through each letter of the input string
    for word in input_string: # Originally, I was only given the a FOR statement here, I wrote in the rest
        new_string+=word.replace(" ","").upper()
        # Add any non-blank letters to the 
        # end of one string, and to the front
        # of the other string. 

    if ___:
        new_string = ___
        reverse_string = ___
    # # Compare the strings
      if ___:
          return True
          return False

print(is_palindrome("Never Odd or Even")) # Should be True
print(is_palindrome("abc")) # Should be False
print(is_palindrome("kayak")) # Should be True

Answer 1

它为我工作，我已经尝试和改变一点点从上面我的代码，它现在与下面的代码工作。

你可以看到它通过了测试和代码验证，参考下面的截图和代码。

def is_palindrome(input_string):
    # We'll create two strings, to compare them
    new_string = ""
    reverse_string = ""
    # Traverse through each letter of the input string
    for letter in input_string.strip():
        # Add any non-blank letters to the 
        # end of one string, and to the front
        # of the other string. 
        new_string = new_string+letter.replace(" ","")
        reverse_string = letter.replace(" ","")+reverse_string
    # Compare the strings
    if new_string.lower() == reverse_string.lower():
        return True
    return False

print(is_palindrome("Never Odd or Even")) # Should be True
print(is_palindrome("abc")) # Should be False
print(is_palindrome("kayak")) # Should be True