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Are tuples more efficient than lists in Python?
...gives tuples a small speed advantage for indexed lookups and unpacking:
$ python3.6 -m timeit -s 'a = (10, 20, 30)' 'a[1]'
10000000 loops, best of 3: 0.0304 usec per loop
$ python3.6 -m timeit -s 'a = [10, 20, 30]' 'a[1]'
10000000 loops, best of 3: 0.0309 usec per loop
$ python3.6 -m timeit -s 'a ...
How to install psycopg2 with “pip” on Python?
... package from source:
Debian/Ubuntu
Python 3
sudo apt install libpq-dev python3-dev
You might need to install python3.8-dev or similar for e.g. Python 3.8.
Python 21
sudo apt install libpq-dev python-dev
If that's not enough, try
sudo apt install build-essential
or
sudo apt install post...
How to import other Python files?
...
Is it still accurate in 2019? Is it python3 or 2?
– Sandburg
Jan 24 '19 at 11:34
|
show 2 more commen...
How to avoid “RuntimeError: dictionary changed size during iteration” error?
...
your python3 solution is not work when you want to delete an object in inner dict. for example you have a dic A and dict B in dict A. if you want to delete object in dict B it occurs error
– Ali-T
...
How do I update pip itself from inside my virtual environment?
...https://bootstrap.pypa.io/get-pip.py -O ./get-pip.py
python ./get-pip.py
python3 ./get-pip.py
This will install the current version which at the time of writing this solution is 9.0.1 which is way beyond what Debian provides.
$ pip --version
pip 9.0.1 from /home/myhomedir/myvirtualenvdir/lib/...
How to run code when a class is subclassed? [duplicate]
...s:
__metaclass__ = Watcher
where Watcher is a subclass of type.
In Python3 the syntax has been changed to
class SuperClass(metaclass=Watcher)
Both are equivalent to
Superclass = Watcher(name, bases, clsdict)
where in this case, name equals the string 'Superclass', and bases is the tupl...
LR性能测试结果样例分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...。使用网页细分图，可以分析网站上有问题的元素（例如下载很慢的图像或打不开的链接）。
我们这里查看一下网页细分图中的“Page Download Time Breakdown”，点击错误！未找到引用源。左边的“New Graph”，出现图1- 14，展开“Web ...
互联网运营人员必备的12款工具 - 资讯 - 清泛网 - 专注C/C++及内核技术
...，你分享的图片一旦被采纳，会获得共享分，如果被别人下载，你还可以获得共享分，你可以用共享分去下载别人的图片。共享分越多，可以下载的图片就越多。
8. 微信内容排版工具
秀米
现在微信公众号越来越多，获取用...
Setting Django up to use MySQL
...
If you are using python3.x then Run below command
pip install mysqlclient
Then change setting.py like
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'DB',
'USER': 'username',
'PASSWORD': 'passwd'...
BugTrap：程序崩溃快照、bug跟踪之利器 - C/C++ - 清泛网 - 专注C/C++及内核技术
...之利器BugTrap的github官网地址：https: github com bchavez BugTrap下载源码可使用CMake进行编译，这里提供一下编译好的dll及lib文件（Unicode BugTrap的github官网地址：https://github.com/bchavez/BugTrap
下载源码解压后可直接进行编译，
这里提...