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class A(object):
    def b(self): return True
    def _c(self): return True
    def __d(self): return True
    
dir(A())
# ['_A__d', ..., '_c', 'b']

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Python 2.7.9 (9c4588d731b7fe0b08669bd732c2b676cb0a8233, Mar 31 2015, 07:51:58)
[PyPy 2.5.1 with GCC 4.2.1 Compatible Apple LLVM 5.1 (clang-503.0.40)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>>> from datetime import datetime
>>>> datetime.strftime(datetime.now(), format='%Y')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: strftime() got an unexpected keyword argument 'format'
>>>> datetime.strftime(datetime.now(), '%Y')
'2015'

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Errors

4xx status code, preventing rewriting of ...

Ok so for some reason pagespeed is doing a fetch (presumably an HTTP sub-request) but getting an invalid response. It would be useful to know which. 404 because it can't find the files? 403 because I've got the permissions wrong?

Fetch failed to start ...

I don't know what that means. I presume it was unable to even start what I expect is the same HTTP sub-request mechanism previously mentioned, but as debug messages go, I cannot even begin to guess at where the problem lies.

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class MyRelation(models.Model):
    """
    This simple example demonstrates the fat model which needs some related data,
    but obviously can't know [without introspecting as I'm doing here] whether or
    not it needs to eagerly fetch the data, or whether it can just enumerate
    the prefetch results.
    """
    
    def prefetched_active_users(self):
        # assumes .prefetch_related('users') has happened.

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#! /usr/bin/env python
from sys import exit
from datetime import datetime
from itertools import product
from selenium import webdriver

RESOLUTIONS = (
        (360, 480),
        (400, 600),
        (480, 320),

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class MyThing(namedtuple('MyThing', 'a b c d')):
    def __table__(self):
      return 'my_thing_table'
  
mything = MyThing(a=1, b=2, c=3, d=4)

# should all happen in begin;commit;close
with DBThingie() as query: # hits __init__ and __enter__ ?
    query("insert into ? (?) values (?)", mything) # hits __call__?
    query("update ? set (?) where (?)", mything) # hits __call__?

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>>> x = u'\u2019'
>>> '%s' % x
u'\u2019'
>>> '%(x)s' % {'x': x}
u'\u2019'
>>> '{}'.format(x)
UnicodeEncodeError: 'ascii' codec can't encode character u'\u2019' in position 0: ordinal not in range(128)
>>> {0!s}'.format(x)
UnicodeEncodeError: 'ascii' codec can't encode character u'\u2019' in position 0: ordinal not in range(128)

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# Logging config should be merged with the defaults in 
# django.util.log.configure_logging() which is called 
# by django.setup()
LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'loggers': {}
}
for app in INSTALLED_APPS:
    LOGGING['loggers'][app] = {

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# see https://github.com/django/django/blob/c32bc1a7a7bbb3d5bd0a2c11bc77dd5ab1c32fbc/django/db/models/base.py#L415
# and http://stackoverflow.com/questions/4523651/how-to-tell-which-fields-have-been-deferred-onlyd-in-a-django-queryset
concrete_fieldnames = (x.attname for x in obj._meta.concrete_fields)
non_deferred = dict(
    (attr, getattr(obj, attr))
    for attr in concrete_fieldnames
    if not isinstance(obj.__class__.__dict__.get(attr), DeferredAttribute)
)

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/*
 if the browser supports it, and the page isn't in focus (tabbed away, etc)
 we change the title to whatever is passed into the anonymous function, 
 as a reminder.
 */
(function(hidden_title, undefined) {
    var has_document;
    var has_title;
    var has_event_handler;
    var original_title;