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如何在 Pocket Option 注册和取款

显示包所在目录及信息,格式为: pip show 。如果不加包名,则提示 ERROR: Please provide a package name or names. 。

如何在 Pocket Option 注册和取款

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2-opt to 3-opt for Travelling Salesman

I am trying to convert my 2-opt implementation of the travelling salesman problem into a 3-opt. I understand that it is, in comparison to 2-opt, removing 3 edges and replacing them to hopefully get a better distance. I am having issue figuring out what to change/add to my 2-opt swap to make it three opt. The main problem I am having is how to make sure all 如何在 Pocket Option 注册和取款 8 varieties of swaps are accounted for in a single swap function. Thank you

and this is what I have for the three-opt, no swap implemented yet.

1 Answer 1

There are actually only 4 forms of 3-opt.

break the tour into 3 parts A->,B->,C->

the 2-opt on the two edges connecting B 如何在 Pocket Option 注册和取款 to A and C are:

i.e. just reverse the tour of B.

reversals are easy to implement and you only have 如何在 Pocket Option 注册和取款 如何在 Pocket Option 注册和取款 to consider 4 variaties.

如何在 Pocket Option 注册和取款

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Python 之 pip安装 及 使用详解

ZC·Shou 于 2018-12-14 13:59:34 如何在 Pocket Option 注册和取款 发布 208276 收藏 451

pip 是啥

pip 是 Python 的包安装程序。其实,pip 就是 Python 标准库(The Python Standard Library)中的一个包,只是这个包比较特殊,用它可以来管理 Python 标准库(The Python Standard Library)中其他的包。pip 支持从 PyPI,版本控制,本地项目以及直接从分发文件进行安装。pip 是一个命令行程序。 安装 pip 后,会向系统添加一个 pip 命令,该命令可以从命令提示符运行。
目前,pip 是 The Python Packaging Authority (PyPA) 推荐的 Python 包管理工具!英文比较好的同学可以直接去官网参看其用户手册

PyPI(The Python Package Index,Python包索引)是 Python 编程语言的软件存储库。通常,我们就是从这上面安装各种 Python 的包,也可以在上面发布自己的包。
The Python Packaging Authority (PyPA) is a working group that maintains many of the relevant projects in Python packaging.

从 Python 2 版本 >=2.7.9 或 Python 3 版本 >=3.4 开始,官网的安装包中已经自带了 pip,在安装时用户可以直接选择安装。或者如果使用由 virtualenv 或者 pyvenv 创建的 Virtual Environment,那么 pip 也是被默认安装的。
如果没有在安装的时候,选择上安装pip,那么也可以从本地安装。例如,直接使用 get-pip.py 进行安装。首先从官网下载 get-pip.py ,然后直接运行 python get-pip.py 即可。

安装后,在命令行中键入: pip + 回车,就会出现如下使用说明:

install

命令行直接键入 pip install + 回车,则 出现如下提示: ERROR: You must give at least one requirement to install (see "pip help install") 。接着我们键入 pip help install ,就会出现 pip install 的使用说明了,如下:

上面一大堆,总结来说,安装命令就是: pip install 或 pip install 如何在 Pocket Option 注册和取款 -r requirements.txt (对于本地安装包可以指定路径)。唯一需要特殊说明的是,安装时可以指定版本号来安装,举例如下:

uninstall

卸载安装包命令: pip uninstall 或 pip uninstall -r requirements.txt

pip install -U 或:pip install --upgrade

freeze

pip freeze 查看已经安装的包及版本信息。导出到指定文件中。例如, pip freeze > requirements.txt ,文件名称随意;也可以使用 pip install -r requirements.txt ,两者等效。

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列出当前已经安装的包。使用命令 pip list -o 则可查询可升级的包。

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显示包所在目录及信息,格式为: pip show 。如果不加包名,则提示 ERROR: Please provide a package 如何在 Pocket Option 注册和取款 name or names. 。

search

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搜索包,格式为: pip search 。如果不写关键字,则提示 ERROR: Missing required argument (search query). 。