The py-django port should have supported_archs noarch, because it does not install any platform-dependent binaries:
$ port contents py27-django | xargs file -b | sort | uniq
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Python script text executable, ASCII text
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a /opt/local/Library/Frameworks/Python.framework/Versions/2.7/Res script text executable, ASCII text
assembler source text, ASCII text
cannot open `Port' (No such file or directory)
cannot open `contains:' (No such file or directory)
cannot open `py27-django' (No such file or directory)
empty
gzip compressed data, was "common-passwords.txt", last modified: Sat Apr 11 08:25:27 2015, from Unix
python 2.7 byte-compiled
troff or preprocessor input text, UTF-8 Unicode text
very short file (no magic)
Fixed.