feifangit

import heroku

HEROKU_TOKEN = "xx-xx-xx"  #used for instance restart
APP_NAME = "xxx"
def restart_heroku(auto=False):
    '''restart heroku instance to re-allocate IP'''
    cloud = heroku.from_key(HEROKU_TOKEN)
    app = cloud.apps[APP_NAME]
    for p in app.processes:
        p.restart()

feifangit

db.stud.aggregate([
{$match:{"scores.type":{$in:["exam","homework"]}}},
{$unwind:"$scores"},
{$group:{_id:"$class_id",csall:{$avg:"$scores.score"}}},
{$sort:{csall:-1}},
{$limit:5}
]
)

feifangit

db.zips.aggregate([
    {$project: 
     {
  fc: {$substr : ["$city",0,1]},
	city:1,pop:1
     }	 
   },
{$match:{fc:{$lte:"9",$gte:"0"}}} ,  
   {
         $group: {

feifangit

db.posts.aggregate([
{$project:{comments:1, author:1}},
{$unwind:"$comments"},
{$group:{_id:"$comments.author",commentnum:{$sum:1}}},
{$sort:{commentnum:-1}},
{$limit:2}
]);

feifangit

db.pop.aggregate([
{$group:{_id:{state:"$state",city:"$city"}, allpop:{$sum:"$pop"}}},
{$match:{allpop:{$gt:25000},"_id.state":{$in:["CA","NY"]}}},
{$group:{_id:null, avgpop:{$avg:"$allpop"}}}
]
)

feifangit

a = set([hashabledict({1:11}), hashabledict({2:22})])
b = set([hashabledict({1:11}), hashabledict({3:33})])
for i in range(3):
    print "set a:", a, id(a)
    copyofa = set(a)
    print "shallow copy ofset a:", copyofa, id(copyofa)
    delta = copyofa-b
    print "delta", delta
    for item in delta:
        print id(item)

feifangit

a = set([hashabledict({1:11}), hashabledict({2:22})])
b = set([hashabledict({1:11}), hashabledict({3:33})])
for i in range(3):
    print "set a:", a
    delta = a-b
    print "delta", delta, id(delta)
    for item in delta:
        print id(item) #always same
        item[1] = "xx"
    print "*"*10

feifangit

import copy
a = set([hashabledict({1:11}), hashabledict({2:22})])
b = set([hashabledict({1:11}), hashabledict({3:33})])
for i in range(3):
    print "set a:", a
    delta = a-b
    print "delta", delta
    for item in copy.deepcopy(delta):
        print id(item)
        item[1] = "xx"

feifangit

### in a seperated file define the function
from django.core.exceptions import  SuspiciousOperation
def skip_suspicious_exception(record):
    if record.exc_info:
        exc_type, exc_value = record.exc_info[:2]
        if isinstance(exc_value, SuspiciousOperation):
            return False
    return True

### in settings.py ###

feifangit

def get_free_space(folder):
    """ Return folder/drive free space
    """
    if platform.system() == 'Windows':
        free_bytes = ctypes.c_ulonglong(0)
        ctypes.windll.kernel32.GetDiskFreeSpaceExW(ctypes.c_wchar_p(folder), None, None, ctypes.pointer(free_bytes))
        return free_bytes.value
    else:
        st = os.statvfs(folder)
        return st.f_bavail * st.f_frsize