最容易的方式是利用管道生成要求书。 要求档案基本上包含一份清单,列出你希望安装的所有假装(或已经安装在纸浆生成的档案中),以及它们重新使用的版本。

a. 编制要求文件,进入你原来的虚拟机构,运行:

pip freeze > requirements.txt

这将为你生成requirements.txt文档。 如果你以你的优良文本编辑宣布该档案,你就认为:

Django==1.3
Fabric==1.0.1
etc...

现在,用以下文字表示:<代码>Django=x.x,表示Django==1.3<>/code>(或您希望安装的新虚拟版本)。

pip install -r requirements.txt

复制<代码>venv1至venv2:

1. Install virtualenv-clone, 或venv1 或圆形虚拟环境venv_dummy。 创建<代码>venv_dummy:

   python -m virtualenv venv_dummy
   source venv_dummy/bin/activate
   

2. To install virtualenv-clone:

   (venv_dummy): pip install virtualenv-clone
   

3. 复制venv1至venv2:

   (venv_dummy): virtualenv-clone venv1/ venv2/
   

If you are using Anaconda you can just run:

conda create --name myclone --clone myenv

This will copy myenv to the newly created environment called myclone.

这里,我去指挥克隆的假环境。

packs=`source-path/bin/pip freeze` && python3 -m venv <env-name> && target-path/bin/pip install $packs

Conventions used in above command:

• source-path = path to env that you want to clone e.g. /home/john/envs/oldenv.
• env-name = name of the cloned env e.g. myenv, it can be a path as well e.g. /home/john/envs/myenv
• target-path = path to new cloned env e.g. /home/john/envs/<env-name>

采用这一方法的优点,或为何更愿意这样做

1. No need to generate a requirements.txt file.
2. No environment is activated/deactivated during cloning process.
3. single command to be executed(3 commands ran at once).

在某些情况下,你可能希望将全球包裹从克隆技术中删除,而你可以取代<条码>源-path/bin/pipzen>/code>,代之以<条码>>-当地here。

In case you use pip "venv". I copy pasted the folder holding the virtual environment and manually changed the files in the bin folder of the copied folder. I don t know if its efficient,but it works!

Can you not simply:

• Copy the existing virtual env directory to a new one
• Update to the new Django?

pip works, but it s a problem on a computer without internet.

I wrote a small code for this, it worked for me. I m writing it here because maybe it will be useful for someone else.

(注:我用Windows 测试)

1. copy project folder
2. paste project folder to another directory
3. change the address parts in this code and run the code:

import os

# The new address of our script folder
script_folder = r D:Python proqramspdf_to_excelvenvScripts 

# the old address of our venv folder
old_path = rb C:UsersAVG-dellDesktoppdf_to_excelvenv 

# the new address of our venv folder
new_path = rb"D:Python proqramspdf_to_excelvenv"


def find_replace( folder ):

    names = os.listdir( folder )

    for name in names:
        current_path = os.path.join( folder, name )

        if os.path.isdir( current_path ):
            find_replace( current_path )

        elif os.path.isfile( current_path ) :

            try:
                with open( current_path , rb  ) as f:
                    data = f.read()

                if old_path in data:
                    print( current_path )

                    data2 = data.replace( old_path , new_path )

                    with open( current_path ,  wb  ) as f:
                        f.write(data2)


            except:
                pass



find_replace( script_folder )

print( completed )