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psycopg2: insert multiple rows with one query
...
New execute_values method in Psycopg 2.7:
data = [(1,'x'), (2,'y')]
insert_query = 'insert into t (a, b) values %s'
psycopg2.extras.execute_values (
cursor, insert_query, data, template=None, page_size=100
)
The pythonic way of doing it in Psycopg 2.6:
d...
项目管理实践教程二、源代码控制【Source Control Using VisualSVN Server ...
...意:提交源代码到服务器时,一定确保本机的代码是最新版本,否则可能提交失败,或者造成版本冲突。
在Model文件夹上点击右键或在Model文件下的空白处点击右键,点击SVN Commit…弹出下面的窗体:
图2-2-9
点击OK按钮后,弹...
The order of keys in dictionaries
...
You could use OrderedDict (requires Python 2.7) or higher.
Also, note that OrderedDict({'a': 1, 'b':2, 'c':3}) won't work since the dict you create with {...} has already forgotten the order of the elements. Instead, you want to use OrderedDict([('a', 1), ('b', 2), (...
Saving an Object (Data persistence)
...can serialize almost anything in python.
We start with a class…
Python 2.7.8 (default, Jul 13 2014, 02:29:54)
[GCC 4.2.1 Compatible Apple Clang 4.1 ((tags/Apple/clang-421.11.66))] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import pickle
>>...
print memory address of Python variable [duplicate]
How do I print the memory address of a variable in Python 2.7?
I know id() returns the 'id' of a variable or object, but this doesn't return the expected 0x3357e182 style I was expecting to see for a memory address.
I want to do something like print &x , where x is a C++ int variable for exam...
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...
C++并发编程(中文版) - 文档下载 - 清泛网 - 专注C/C++及内核技术
C++并发编程(中文版)C++并发编程(中文版)作为对《C++ Concurrency in Action》的中文翻译。本书是基于C++11新标准的并发和多线程编程深度指南。从std::thr 作为对《C++ Concurrency in Action》的中文翻译。
本书是基于C++11新标准的并...
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 ...
Usage of __slots__?
...gs to __slots__.
To verify this, using the Anaconda distribution of Python 2.7 on Ubuntu Linux, with guppy.hpy (aka heapy) and sys.getsizeof, the size of a class instance without __slots__ declared, and nothing else, is 64 bytes. That does not include the __dict__. Thank you Python for lazy evaluati...
第一个Hello,OS World操作系统 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...汇编编译工具,用户将我们的汇编代码编译为二进制。(下载地址)
Bochs:运行os的虚拟机工具,模拟加载我们生成的软盘映像,并运行os。(下载地址)
代码如下:
;--------------------------------------------------------------
; 平...
