判断字符串是否为回文 python

回文正序和逆序一样的字符串，例如abccba

方法一

def is_palindrome1(text):
    l = list(text)
    l.reverse()
    t1 = ''.join(l)
    if t1 == text:
        print 'the text is palindrome'
    else:
        print 'the text is not palindrome'

方法二

def is_palindrome2(text):
    t1 = text[::-1]
    if t1 == text:
        print 'the text is palindrome'
    else:
        print 'the text is not palindrome'

方法三

def is_palindrome3(text):
    r = True
    for x in range(len(text)):
        print x,text[x]
        if text[x] != text[len(text)-x-1]:
            print 1
            r = False
            break
    if r == True:
        print 'the text is palindrome'
    else:
        print 'the text is not palindrome'