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pwd.struct_passwd has different representations in cpython 2.7.2 and pypy 1.5
A unit test from cpython might enforce the same representation across interpreters:
>>> print pwd.getpwuid(os.getuid())
Current cpython output:
pwd.struct_passwd(pw_name='demo_user', pw_passwd='********', pw_uid=1001, pw_gid=100, pw_gecos='demo_user', pw_dir='/Users/demo_user', pw_shell='/bin/bash')
Current pypy output
('demo_user', '********', 1001, 100, 'demo_user', '/Users/demo_user', '/bin/bash')

Looks like the difference between a regular tuple and a named tuple. The correct test is to access the members using the names, and the test suite currently does this. The repr shouldn't, I think, be required to be identical.
On the other hand, if pypy is implementing named tuples and the repr doesn't include the names, perhaps there is a missing test in the tests of named tuples.

The docs indeed don’t say more that "Password database entries are reported as a tuple-like object, whose attributes correspond to the members of the passwd structure"; no mention is made of named tuple or struct sequence.
I think there is no bug for CPython; you may want to suggest friendlier reprs for structseqs to PyPy.

pypy did not use a structseq in this case. Fixed in (pypy's repo) dded6e510044 

But pypy passed the attribute access tests in the test suite?

Actually, I’ve found that there are some structseq’s repr that get tested in the CPython test suite.