自动解码以base64格式编码的多行字符串

Question

我正在开发解码下面给出的以base64格式编码的反向多行字符串。

LnNlbHBtYXhlIGVzdSBvdCBlZXJmIGxlZUYgLnNldGlzYmV3IGNpZmZhcnQgaGdpaCBubyBub2l0YXNpbGFtcm9uZWQgZm8gdHBlY25vYyBlaHQgZWJpcmNzZUQgLjQ = ZWxpZiBlbm8gbmkgZWIgdHN1TSApaXYgICAg

s = 'ZWxpZiBlbm8gbmkgZWIgdHN1TSApaXYgICAg' 
s = s.decode('base64', 'strict') 

print s[::-1] 

通过上面的方法我得到正确的字符串，但我必须手动更改字符串。

请帮助。

Answer 1

从OP的评论：

list = ['LnNlbHBtYXhlIGVzdSBvdCBlZXJmIGxlZUYgLnNldGlzYmV3IGNpZmZhcnQgaGdpaCBubyBub2l0YXNpbGFtcm9uZWQgZm8gdHBlY25vYyBlaHQgZWJpcmNzZUQgLjQ=', 'ZWxpZiBlbm8gbmkgZWIgdHN1TSApaXYgICAg', 'c25vaXRhY2lmaWNlcHMgOC1QRVAgdGVlbSB0c3VNICl2ICAgIA==', 'Ni4yIG5vaHR5UCBodGl3IGtyb3cgdHN1TSApdmkgICAg', 'c2VsdWRvbSByZWh0byB5YiBlbGJhdHJvcG1pIGViIGRsdW9ocyBzc2FsQyApaWlpICAgIA=='] 
s = ''.join(list) 
s = s.decode('base64', 'strict') 
print (s[::-1]) 

的join操作连接所有串在一起，但只有第一个字符串转换。这是因为，在解码基本64字符串时，忽略字符串中第一个或第二个=字符中的所有内容。取而代之的加盟，迭代：

list = ['LnNlbHBtYXhlIGVzdSBvdCBlZXJmIGxlZUYgLnNldGlzYmV3IGNpZmZhcnQgaGdpaCBubyBub2l0YXNpbGFtcm9uZWQgZm8gdHBlY25vYyBlaHQgZWJpcmNzZUQgLjQ=', 'ZWxpZiBlbm8gbmkgZWIgdHN1TSApaXYgICAg', 'c25vaXRhY2lmaWNlcHMgOC1QRVAgdGVlbSB0c3VNICl2ICAgIA==', 'Ni4yIG5vaHR5UCBodGl3IGtyb3cgdHN1TSApdmkgICAg', 'c2VsdWRvbSByZWh0byB5YiBlbGJhdHJvcG1pIGViIGRsdW9ocyBzc2FsQyApaWlpICAgIA=='] 
for s in list: 
    s = s.decode('base64', 'strict') 
    print (s[::-1]) 

或者使用列表理解。

list = ['LnNlbHBtYXhlIGVzdSBvdCBlZXJmIGxlZUYgLnNldGlzYmV3IGNpZmZhcnQgaGdpaCBubyBub2l0YXNpbGFtcm9uZWQgZm8gdHBlY25vYyBlaHQgZWJpcmNzZUQgLjQ=', 'ZWxpZiBlbm8gbmkgZWIgdHN1TSApaXYgICAg', 'c25vaXRhY2lmaWNlcHMgOC1QRVAgdGVlbSB0c3VNICl2ICAgIA==', 'Ni4yIG5vaHR5UCBodGl3IGtyb3cgdHN1TSApdmkgICAg', 'c2VsdWRvbSByZWh0byB5YiBlbGJhdHJvcG1pIGViIGRsdW9ocyBzc2FsQyApaWlpICAgIA=='] 
print "\n".join(s.decode('base64')[::-1] for s in list) 

输出：

4. Describe the concept of denormalisation on high traffic websites. Feel free to use examples. 
    vi) Must be in one file 
    v) Must meet PEP-8 specifications 
    iv) Must work with Python 2.6 
    iii) Class should be importable by other modules