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Reported on IRC.

Password for user UserBot on mywiki:ar (no characters will be shown): 
Logging in to mywiki:ar as UserBot
Could not load cache: UnicodeDecodeError('ascii', 'Site("ar", "mywiki")User(\xd9\x85\xd8\xb3\xd8\xaa\xd8\xae\xd8\xaf\xd9\x85:UserBot)[(\'action\', \'paraminfo\'), (\'format\', \'json\'), (\'maxlag\', \'5\'), (\'querymodules\', \'info|revisions\')]', 31, 32, 'ordinal not in range(128)')
Traceback (most recent call last):
  File "pwb.py", line 153, in <module>
    run_python_file(fn, argv, argvu)
  File "pwb.py", line 67, in run_python_file
    exec(compile(source, filename, "exec"), main_mod.__dict__)
  File "scripts/pagefromfile.py", line 274, in <module>
    main()
  File "scripts/pagefromfile.py", line 271, in main
    bot.run()
  File "scripts/pagefromfile.py", line 85, in run
    self.save(title, contents)
  File "scripts/pagefromfile.py", line 141, in save
    page.save(comment, minor=self.getOption('minor'))
  File "/Users/user/shell/core/pywikibot/__init__.py", line 423, in wrapper
    return method(*__args, **__kw)
  File "/Users/user/shell/core/pywikibot/page.py", line 886, in save
    **kwargs)
  File "/Users/user/shell/core/pywikibot/page.py", line 896, in _save
    watch=watchval, bot=botflag, **kwargs)
  File "/Users/user/shell/core/pywikibot/site.py", line 557, in callee
    return fn(self, *args, **kwargs)
  File "/Users/user/shell/core/pywikibot/site.py", line 2787, in editpage
    lastrev = page.latestRevision()
  File "/Users/user/shell/core/pywikibot/page.py", line 364, in latestRevision
    self.site.loadrevisions(self)
  File "/Users/user/shell/core/pywikibot/site.py", line 1922, in loadrevisions
    step=step, total=total, **rvargs)
  File "/Users/user/shell/core/pywikibot/site.py", line 693, in _generator
    gen = gen_class(type_arg, site=self, **args)
  File "/Users/user/shell/core/pywikibot/data/api.py", line 885, in __init__
    QueryGenerator.__init__(self, prop=prop, **kwargs)
  File "/Users/user/shell/core/pywikibot/data/api.py", line 560, in __init__
    self.update_limit()  # sets self.prefix
  File "/Users/user/shell/core/pywikibot/data/api.py", line 654, in update_limit
    for param in self._modules[mod].get("parameters", []):
  File "/Users/user/shell/core/pywikibot/data/api.py", line 604, in _modules
    data = paramreq.submit()
  File "/Users/user/shell/core/pywikibot/data/api.py", line 510, in submit
    self._write_cache(self._data)
  File "/Users/user/shell/core/pywikibot/data/api.py", line 503, in _write_cache
    with open(self._cachefile_path(), 'wb') as f:
  File "/Users/user/shell/core/pywikibot/data/api.py", line 478, in _cachefile_path
    return os.path.join(self._get_cache_dir(), self._create_file_name())
  File "/Users/user/shell/core/pywikibot/data/api.py", line 474, in _create_file_name
    self._uniquedescriptionstr().encode('utf-8')
UnicodeDecodeError: 'ascii' codec can't decode byte 0xd9 in position 31: ordinal not in range(128)
<type 'exceptions.UnicodeDecodeError'>
CRITICAL: Waiting for 1 network thread(s) to finish. Press ctrl-c to abort



We should add a test with a non-ascii username/namespace (or we should just test on arwiki instead of enwiki :-p)