Question

我有一个部署到Heroku的Node（Express服务器）项目运行正常但是我有一个小的Python模块我写的不需要服务器或新的Heroku实例，但它需要安装一些第三方软件包来自PIP。

我的问题是，虽然Python似乎运行正常（print()完全在.py文件中工作）但它不会安装模块。我运行pip freeze并将requirements.txt文件添加到项目的根目录中。该文件看起来像：

funcy==1.6
numpy==1.10.2
scipy==0.16.1

但是当我部署Heroku时没有检测到任何python并且似乎没有安装它们而且我得到了：

Traceback (most recent call last): File "src/blm/algo.py", line 4, in <module> from package import mvo File "/app/src/blm/package/mvo.py", line 1, in <module> import numpy as np ImportError: No module named 'numpy'

Heroku的输出

-----> Using set buildpack heroku/nodejs
-----> Node.js app detected
-----> Creating runtime environment

       NPM_CONFIG_LOGLEVEL=error
       NPM_CONFIG_PRODUCTION=true
       NODE_ENV=production
       NODE_MODULES_CACHE=true
-----> Installing binaries
       engines.node (package.json):  unspecified
       engines.npm (package.json):   unspecified (use default)

       Resolving node version (latest stable) via semver.io...
       Downloading and installing node 5.8.0...
       Using default npm version: 3.7.3
-----> Restoring cache
       Loading 2 from cacheDirectories (default):
       - node_modules
       - bower_components (not cached - skipping)
-----> Building dependencies
       Pruning any extraneous modules
       Installing node modules (package.json)

       > my-project@0.0.1 postinstall /tmp/build_c845357a6a491eb02f8ad4b043020ac6/my-project-7f7e7fe8632473e1f1f88f430b040396fb10671f
       > webpack --config ./webpack-production.config.js --progress --colors

Hash: 2ceaeac5876ff2e2463e
       Version: webpack 1.12.14
       Time: 15178ms
       Asset    Size  Chunks             Chunk Names
       bundle.js  455 kB       0  [emitted]  main
       main.css   15 kB       0  [emitted]  main
       + 272 hidden modules
       Child extract-text-webpack-plugin:
       + 2 hidden modules
-----> Caching build
       Clearing previous node cache
       Saving 2 cacheDirectories (default):
       - node_modules
       - bower_components (nothing to cache)
-----> Build succeeded!
       ├── babel-core@6.7.2
       ├── babel-loader@6.2.4
       ├── babel-preset-es2015@6.6.0
       ├── babel-preset-react@6.5.0
       ├── babel-preset-stage-0@6.5.0
       ├── bcrypt@0.8.5
       ├── css-loader@0.23.1
       ├── d3@3.5.16
       ├── d3pie@0.1.9
       ├── express@4.13.4
       ├── extract-text-webpack-plugin@1.0.1
       ├── jquery@2.2.2
       ├── node-sass@3.4.2
       ├── node-uuid@1.4.7
       ├── react@0.14.7
       ├── react-dom@0.14.7
       ├── react-redux@4.4.1
       ├── react-router@2.0.1
       ├── redux@3.3.1
       ├── sass-loader@3.2.0
       ├── style-loader@0.13.0
       └── webpack@1.12.14

-----> Discovering process types
       Procfile declares types -> web
-----> Compressing...
       Done: 30M
-----> Launching...
       Released v13
       https://my-project.herokuapp.com/ deployed to Heroku

=== UPDATE ===

我还尝试添加一个“pipinstall”工作程序，看它是否会安装，但什么也没发生。

Procfile：

web: node server.js
pipinstall: pip install -r requirements.txt

Answer 1

您的应用需要多个buildpack。

运行以下命令：

heroku config：设置BUILDPACK_URL = https://github.com/ddollar/heroku-buildpack-multi

然后，在项目根目录中名为.buildpacks的文件中添加以下内容：

https://github.com/heroku/heroku-buildpack-python.git
https://github.com/heroku/heroku-buildpack-nodejs.git

或者，您可以使用heroku toolbelt命令（heroku buildpacks：set和heroku buildpacks：add）来配置多个构建包，如here所述。

在Heroku项目中使用Python模块的节点应用程序不安装

1 个答案: