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String concatenation: concat() vs “+” operator
...then throwing it away when you create the final String. In practice memory allocation is surprisingly fast.
Update: As Pawel Adamski notes, performance has changed in more recent HotSpot. javac still produces exactly the same code, but the bytecode compiler cheats. Simple testing entirely fails bec...
Why is __dirname not defined in node REPL?
...
Yeah, that should really be added to the answer Eye, because that's what got me.
– Tomáš Zato - Reinstate Monica
Oct 12 '15 at 17:14
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Disable a method in a ViewSet, django-rest-framework
...ethods but I did not able to find out how to disable the PATCH method specially if you are using routers.
– Muneeb Ahmad
Mar 31 '15 at 14:56
3
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Python integer division yields float
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@JonathanSternberg except for all the code that was written for python 2.0. I feel like the role of / and // should be reversed to keep backwards compatibility. Also, in pretty much every other language / preserves type. i would make more sense then fo...
How do I check if there are duplicates in a flat list?
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Use set() to remove duplicates if all values are hashable:
>>> your_list = ['one', 'two', 'one']
>>> len(your_list) != len(set(your_list))
True
share
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Proper way to return JSON using node or Express
...n do this by changing the options instead.
'json replacer' JSON replacer callback, null by default
'json spaces' JSON response spaces for formatting, defaults to 2 in development, 0 in production
Not actually recommended to set to 40
app.set('json spaces', 40);
Then you could just respond with so...
In a Django form, how do I make a field readonly (or disabled) so that it cannot be edited?
...hanged his example to work with Django 1.3, using get_readonly_fields.
Usually you should declare something like this in app/admin.py:
class ItemAdmin(admin.ModelAdmin):
...
readonly_fields = ('url',)
I've adapted in this way:
# In the admin.py file
class ItemAdmin(admin.ModelAdmin):
...
Disable output buffering
...stdout with
some other stream like wrapper which
does a flush after every call.
class Unbuffered(object):
def __init__(self, stream):
self.stream = stream
def write(self, data):
self.stream.write(data)
self.stream.flush()
def writelines(self, datas):
self.stream....
Python multiprocessing PicklingError: Can't pickle
...the one you posted:
Exception in thread Thread-2:
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 552, in __bootstrap_inner
self.run()
File "/usr/lib/python2.7/threading.py", line 505, in run
self.__target(*self.__args, **self.__kwargs)
File "/usr/lib/p...
【BLE技术内幕】BLE技术揭秘 - 创客硬件开发 - 清泛IT论坛，有思想、有深度
文章源自：http://doc.iotxx.com/index.php?title=BLE技术揭秘
BLE技术揭秘
BLE是低功耗蓝牙的英文缩写（Bluetooth Low Energy），是蓝牙4.0版本起开始支持的新的、低功耗版本的蓝牙技术规范。蓝牙技术联盟（Bluetooth SIG）在2010年发布了跨...