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Editorial Team
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Asked: 2026-06-16T00:30:09+00:00

I am trting to decode the below given reversed multi line string encoded in

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I am trting to decode the below given reversed multi line string encoded in base64 format.

LnNlbHBtYXhlIGVzdSBvdCBlZXJmIGxlZUYgLnNldGlzYmV3IGNpZmZhcnQgaGdpaCBubyBub2l0YXNpbGFtcm9uZWQgZm8gdHBlY25vYyBlaHQgZWJpcmNzZUQgLjQ=
ZWxpZiBlbm8gbmkgZWIgdHN1TSApaXYgICAg

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

print s[::-1]

by the above method I get correct strings but I have to change the string manually.

Please help.

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1 Answer

  1. Editorial Team

    From the OP’s comment:

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

    the join operation connects all of the strings together, but only the first string is translated. This is because, when decoding a base 64 string, everything in the string past the first one or two = characters is ignored. Instead of joining, iterate:

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

    Or use a list comprehension.

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

    Output:

    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
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