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class MyModelChoiceField(ModelChoiceField):
    def label_from_instance(self, obj):
        return "hello"
        
# or

class MyForm(Form):
    def __init__(self, *args, **kwargs):
        super(MyForm, self).__init__(*args, **kwargs)
        if 'myfield' in self.fields:

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@contextmanager
def copyable(obj):
  oldval = copy(obj.pk)
  obj.pk = None
  yield obj
  obj.pk = oldval
  
  
with copyable(obj) as tosave:  # I might've forgotten the as part initially.
  newobj = tosave.save()

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querysets = (
  Page.objects.filter(...),
  Something.objects.exclude(...),
  Etc.objects.filter(...),
)
results = {qs.count(): (index, qs) for index, qs in enumerate(querysets)}
best = max(results)
worst = min(results)
if best > 0:
  best_counts = results[best][1]

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import operator
teammembers = request.GET.getlist("teammembers")
all_qs = []

for teammate in teammembers:
  name = teammate.strip().split()
  # nb: assuming only one space ("forename surname") isn't great.
  try:
    first_name = name[0].strip()
  except IndexError:

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from collections import namedtuple, defaultdict
from operator import itemgetter


ClassUsage = namedtuple('ClassUsage', 'cls attrs')
AttributeUsage = namedtuple('AttributeUsage', 'name count')
attrname = itemgetter(0)
attrcount = itemgetter(1)

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import os, codecs, functools
from collections import namedtuple
from django.template.loader import get_template
from django.template import TemplateDoesNotExist


MISSING = object()


def django_handler(path):

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from django.template import TemplateDoesNotExist, get_template

def path_to_file(request, template_name):
    # assert template_name in some_safe_list if you want.
    try:
        get_template(template_name)
    except TemplateDoesNotExist:
        return render("some_fallback.html", request, context)
    return render(template_name, request, context)
  

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import argparse
import os
import sys
from wrapt import CallableObjectProxy, wrap_object


def _dot_lookup(thing, comp, import_path):
    try:
        return getattr(thing, comp)
    except AttributeError:

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import re
import markdown2
z = re.compile('\<(?P<lol>h[1-6])\>(.+?)\<\/(?P=lol)\>')
x = """
#### lol
## lol
        <h1>lol</h1>
\n```
<h2>heh</h2>
```

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import re
x = r"""
/* comment 1 */
/***
  comment 2
***/
/*=================
comment 3
*/
/*comment 4*/