如何使用pip下载可用的Windows二进制文件以及所有其他源文件 [英] How to download available Windows binaries with pip, and source for all else

问题描述

我必须管理两个单独的Python设置，一个在具有Internet连接的Linux机器上，一个在离线Windows机器上.对于给定的一组必需软件包，我想在Linux机器上下载必要文件，然后将它们传输到Windows机器并在此处安装.

I have to administrate two separate Python setups, one on a Linux Machine with internet connection, and one offline Windows machine. For a given set of required packages, I would like to download the necessary files on the Linux machine, transfer them to the Windows machine and install them there.

以下按预期工作:

pip3 download virtualenv --platform win_amd64 -d py_packages_20180222/ --only-binary=:all:

文件virtualenv-15.1.0-py2.py3-none-any.whl已下载到所需位置，并准备传输.但是，如果pip找不到二进制文件，则会产生错误:

The file virtualenv-15.1.0-py2.py3-none-any.whl is downloaded to the desired location, and ready for transfer. However, if pip doesn't find a binary file, it produces an error:

pip3 download ipython --platform win_amd64 -d py_packages_20180222/ --only-binary=:all:
 Could not find a version that satisfies the requirement simplegeneric>0.8 (from ipython) (from versions: )
No matching distribution found for simplegeneric>0.8 (from ipython)

由于设置--only-binary=:all:，这是预期的输出，但是这不是我想要的输出.在这种情况下，我希望pip代替下载源代码(带有警告)并继续.我实质上是在寻找pip选项--only-binary=:if_available:.是否存在?

This is the expected output due to the setting --only-binary=:all:, however it is not my desired output. In such a case, I would like pip to download the source code instead (with a warning) and continue. I'm essentially looking for the pip option --only-binary=:if_available:. Does this exist?

不，不是.感谢接受的答案，我能够使用以下bash脚本找到解决方案:

No, it doesn't. Thanks to the accepted answer, I was able to find my solution in using the following bash script:

#!/usr/bin/env python3

import subprocess

pkges = ['virtualenv', 
         'ipython']

for pkg in pkges:
    cmd = ['pip3',
           'download',
           pkg,
           '--platform',
           'win_amd64',
           '-d py_packages_20180222/',
           '--only-binary=:all:']

    result = subprocess.run(cmd)
    if result.returncode != 0:
        print("No binary found for pkg. Downlaoding source code instead")
        cmdalt = ['pip3',
                  'download',
                  pkg,
                  '-d py_packages_20180222/']
        subprocess.run(cmdalt)

推荐答案

否，根据 pip文档，这样的选项不存在:

No, according to the pip documentation, such an option does not exist:

--only-binary <format_control>:请勿使用源程序包.可以多次提供，每次都增加到现有值.接受:all:禁用所有源软件包，:none:清空集合，或者接受一个或多个软件包名称，并且它们之间用逗号分隔.如果没有二进制分发包，则在使用此选项时将无法安装.

--only-binary <format_control>: Do not use source packages. Can be supplied multiple times, and each time adds to the existing value. Accepts either :all: to disable all source packages, :none: to empty the set, or one or more package names with commas between them. Packages without binary distributions will fail to install when this option is used on them.

您可以在一个小的脚本中用一个条件来达到预期的效果，也许像这样(这只是一个草图，但是我不是Python专家):

You could achieve the desired effect with a conditional in a small script, maybe something like this (this is just a sketch and I'm not a Python expert, though):

#!/usr/bin/env python3

import subprocess

cmd = ['pip3',
       'download',
       'ipython',
       '--platform',
       'win_amd64',
       '-d py_packages_20180222/',
       '--only-binary=:all:']

result = subprocess.run(cmd)
if result.returncode != 0:
    print("oh noes")
    # put here what should happen if the download of the binaries fails

这篇关于如何使用pip下载可用的Windows二进制文件以及所有其他源文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！