class A:
b = ForeignKey(B)b.a_set.all() # Или filter, get. В общем, обычный QuerySet{% for contact in node.contact_set.all %}
{{ contact.full_name }}
{% endfor %}subdivisions = Subdivision.objects.all()subdivisions = Subdivision.objects.all().prefetch_related('contact_set')
def is_dir(path):
return os.path.exists(path) and not os.path.isfile(path)
def dir_list(path):
dirs = []
for fname in os.listdir(path):
full_path = os.path.join(path, fname)
if is_dir(full_path):
dirs.append(full_path)
dirs += dir_list(full_path)
return dirsfor path, dirs, files in os.walk(path):
for f in dirs:
...
import itertools
objects = itertools.chain(TVlist.objects.all(), IntList.objects.all())
def tree(levels=0, func=None):
if levels > 0 and func:
return defaultdict(reduce(lambda f, i: lambda: defaultdict(f), xrange(levels-1), func))
else:
return defaultdict(tree)>>> d = tree()
>>> d[1][2][3][4][5] = 6
>>> d = tree(3, float)
>>> d
defaultdict(<function <lambda> at 0x0280E3F0>, {})
>>> d[1][2][3]
0.0
>>> d[7][8][9] += 10
>>> d[7][8][9]
10.0def tree(func=lambda: tree(), depth=0):
return defaultdict(reduce(lambda f, i: lambda: defaultdict(f), xrange(depth-1), func))
