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How do I detect whether a Python variable is a function?
...obj)
If this is for Python 3.x but before 3.2, check if the object has a __call__ attribute. You can do this with:
hasattr(obj, '__call__')
The oft-suggested types.FunctionTypes approach is not correct because it fails to cover many cases that you would presumably want it to pass, like with bui...
How to make a cross-module variable?
The __debug__ variable is handy in part because it affects every module. If I want to create another variable that works the same way, how would I do it?
...
Is it safe to push_back an element from the same vector?
If the second push_back causes a reallocation, the reference to the first integer in the vector will no longer be valid. So this isn't safe?
...
How to save all the variables in the current python session?
...r work:
import shelve
T='Hiya'
val=[1,2,3]
filename='/tmp/shelve.out'
my_shelf = shelve.open(filename,'n') # 'n' for new
for key in dir():
try:
my_shelf[key] = globals()[key]
except TypeError:
#
# __builtins__, my_shelf, and imported modules can not be shelved.
...
Django: Get list of model fields?
...to get a list of all the fields defined for this model. For example, phone_number = CharField(max_length=20) . Basically, I want to retrieve anything that inherits from the Field class.
...
Lua简明教程 - 脚本技术 - 清泛IT论坛，有思想、有深度
...ble来管理全局变量的，Lua把这些全局变量放在了一个叫“_G”的Table里。我们可以用如下的方式来访问一个全局变量（假设我们这个全局变量名叫globalVar）：_G.globalVar
_G["globalVar"]复制代码
我们可以通过下面的方式来遍历...
MIN and MAX in C
...afety bonus too) in a GCC statement expression:
#define max(a,b) \
({ __typeof__ (a) _a = (a); \
__typeof__ (b) _b = (b); \
_a > _b ? _a : _b; })
Everyone says "oh I know about double evaluation, it's no problem" and a few months down the road, you'll be debugging the silliest ...
Node.js - getting current filename
... is then easy:
var path = require('path');
var scriptName = path.basename(__filename);
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How to perform OR condition in django queryset?
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from django.db.models import Q
User.objects.filter(Q(income__gte=5000) | Q(income__isnull=True))
via Documentation
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How to get a reference to a module inside the module itself?
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import sys
current_module = sys.modules[__name__]
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